Solve for a
a=-36
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4\times 4a+36=3\times 5a
Multiply both sides of the equation by 36, the least common multiple of 9,12.
16a+36=3\times 5a
Multiply 4 and 4 to get 16.
16a+36=15a
Multiply 3 and 5 to get 15.
16a+36-15a=0
Subtract 15a from both sides.
a+36=0
Combine 16a and -15a to get a.
a=-36
Subtract 36 from both sides. Anything subtracted from zero gives its negation.
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