3a-7a=4y-9(-4)

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Solution for 3a-7a=4y-9(-4) equation: 


Simplifying
3a + -7a = 4y + -9(-4)

Combine like terms: 3a + -7a = -4a
-4a = 4y + -9(-4)

Multiply -9 * -4
-4a = 4y + 36

Reorder the terms:
-4a = 36 + 4y

Solving
-4a = 36 + 4y

Solving for variable 'a'.

Move all terms containing a to the left, all other terms to the right.

Divide each side by '-4'.
a = -9 + -1y

Simplifying
a = -9 + -1y

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