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5x\times 2+5\times 6=7x
Variable x cannot be equal to 0 since division by zero is not defined. Multiply both sides of the equation by 5x, the least common multiple of x,5.
10x+5\times 6=7x
Multiply 5 and 2 to get 10.
10x+30=7x
Multiply 5 and 6 to get 30.
10x+30-7x=0
Subtract 7x from both sides.
3x+30=0
Combine 10x and -7x to get 3x.
3x=-30
Subtract 30 from both sides. Anything subtracted from zero gives its negation.
x=\frac{-30}{3}
Divide both sides by 3.
x=-10
Divide -30 by 3 to get -10.