Solve for y
y=8
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5\times 2.8=y\times \frac{1\times 4+3}{4}
Variable y cannot be equal to 0 since division by zero is not defined. Multiply both sides of the equation by 5y, the least common multiple of y,5.
14=y\times \frac{1\times 4+3}{4}
Multiply 5 and 2.8 to get 14.
14=y\times \frac{4+3}{4}
Multiply 1 and 4 to get 4.
14=y\times \frac{7}{4}
Add 4 and 3 to get 7.
y\times \frac{7}{4}=14
Swap sides so that all variable terms are on the left hand side.
y=14\times \frac{4}{7}
Multiply both sides by \frac{4}{7}, the reciprocal of \frac{7}{4}.
y=\frac{14\times 4}{7}
Express 14\times \frac{4}{7} as a single fraction.
y=\frac{56}{7}
Multiply 14 and 4 to get 56.
y=8
Divide 56 by 7 to get 8.
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