7a-15-9a+25=90

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Solution for 7a-15-9a+25=90 equation:


Simplifying
7a + -15 + -9a + 25 = 90

Reorder the terms:
-15 + 25 + 7a + -9a = 90

Combine like terms: -15 + 25 = 10
10 + 7a + -9a = 90

Combine like terms: 7a + -9a = -2a
10 + -2a = 90

Solving
10 + -2a = 90

Solving for variable 'a'.

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

Add '-10' to each side of the equation.
10 + -10 + -2a = 90 + -10

Combine like terms: 10 + -10 = 0
0 + -2a = 90 + -10
-2a = 90 + -10

Combine like terms: 90 + -10 = 80
-2a = 80

Divide each side by '-2'.
a = -40

Simplifying
a = -40

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