Solve for a
a=3
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15\left(-5\right)=-a\times 25
Variable a cannot be equal to 0 since division by zero is not defined. Multiply both sides of the equation by 15a, the least common multiple of a,-15.
-75=-a\times 25
Multiply 15 and -5 to get -75.
-75=-25a
Multiply -1 and 25 to get -25.
-25a=-75
Swap sides so that all variable terms are on the left hand side.
a=\frac{-75}{-25}
Divide both sides by -25.
a=3
Divide -75 by -25 to get 3.
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