8a-9+7a+1=90

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Solution for 8a-9+7a+1=90 equation:


Simplifying
8a + -9 + 7a + 1 = 90

Reorder the terms:
-9 + 1 + 8a + 7a = 90

Combine like terms: -9 + 1 = -8
-8 + 8a + 7a = 90

Combine like terms: 8a + 7a = 15a
-8 + 15a = 90

Solving
-8 + 15a = 90

Solving for variable 'a'.

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

Add '8' to each side of the equation.
-8 + 8 + 15a = 90 + 8

Combine like terms: -8 + 8 = 0
0 + 15a = 90 + 8
15a = 90 + 8

Combine like terms: 90 + 8 = 98
15a = 98

Divide each side by '15'.
a = 6.533333333

Simplifying
a = 6.533333333

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