-7a+15=-90

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Solution for -7a+15=-90 equation: 


Simplifying
-7a + 15 = -90

Reorder the terms:
15 + -7a = -90

Solving
15 + -7a = -90

Solving for variable 'a'.

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

Add '-15' to each side of the equation.
15 + -15 + -7a = -90 + -15

Combine like terms: 15 + -15 = 0
0 + -7a = -90 + -15
-7a = -90 + -15

Combine like terms: -90 + -15 = -105
-7a = -105

Divide each side by '-7'.
a = 15

Simplifying
a = 15

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