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1260y\times \frac{13}{7}+1260y\left(-\frac{1}{5}\right)+70y\times 27-45y\times 21=1260x
Multiply both sides of the equation by 1260y, the least common multiple of 7,5,18,28,y.
2340y+1260y\left(-\frac{1}{5}\right)+70y\times 27-45y\times 21=1260x
Multiply 1260 and \frac{13}{7} to get 2340.
2340y-252y+70y\times 27-45y\times 21=1260x
Multiply 1260 and -\frac{1}{5} to get -252.
2088y+70y\times 27-45y\times 21=1260x
Combine 2340y and -252y to get 2088y.
2088y+1890y-45y\times 21=1260x
Multiply 70 and 27 to get 1890.
3978y-45y\times 21=1260x
Combine 2088y and 1890y to get 3978y.
3978y-945y=1260x
Multiply 45 and 21 to get 945.
1260x=3978y-945y
Swap sides so that all variable terms are on the left hand side.
1260x=3033y
Combine 3978y and -945y to get 3033y.
\frac{1260x}{1260}=\frac{3033y}{1260}
Divide both sides by 1260.
x=\frac{3033y}{1260}
Dividing by 1260 undoes the multiplication by 1260.
x=\frac{337y}{140}
Divide 3033y by 1260.
1260y\times \frac{13}{7}+1260y\left(-\frac{1}{5}\right)+70y\times 27-45y\times 21=1260x
Variable y cannot be equal to 0 since division by zero is not defined. Multiply both sides of the equation by 1260y, the least common multiple of 7,5,18,28,y.
2340y+1260y\left(-\frac{1}{5}\right)+70y\times 27-45y\times 21=1260x
Multiply 1260 and \frac{13}{7} to get 2340.
2340y-252y+70y\times 27-45y\times 21=1260x
Multiply 1260 and -\frac{1}{5} to get -252.
2088y+70y\times 27-45y\times 21=1260x
Combine 2340y and -252y to get 2088y.
2088y+1890y-45y\times 21=1260x
Multiply 70 and 27 to get 1890.
3978y-45y\times 21=1260x
Combine 2088y and 1890y to get 3978y.
3978y-945y=1260x
Multiply 45 and 21 to get 945.
3033y=1260x
Combine 3978y and -945y to get 3033y.
\frac{3033y}{3033}=\frac{1260x}{3033}
Divide both sides by 3033.
y=\frac{1260x}{3033}
Dividing by 3033 undoes the multiplication by 3033.
y=\frac{140x}{337}
Divide 1260x by 3033.
y=\frac{140x}{337}\text{, }y\neq 0
Variable y cannot be equal to 0.