4a-7-9a+16=20

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Solution for 4a-7-9a+16=20 equation:


Simplifying
4a + -7 + -9a + 16 = 20

Reorder the terms:
-7 + 16 + 4a + -9a = 20

Combine like terms: -7 + 16 = 9
9 + 4a + -9a = 20

Combine like terms: 4a + -9a = -5a
9 + -5a = 20

Solving
9 + -5a = 20

Solving for variable 'a'.

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

Add '-9' to each side of the equation.
9 + -9 + -5a = 20 + -9

Combine like terms: 9 + -9 = 0
0 + -5a = 20 + -9
-5a = 20 + -9

Combine like terms: 20 + -9 = 11
-5a = 11

Divide each side by '-5'.
a = -2.2

Simplifying
a = -2.2

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