-6(1+2a)=90

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Solution for -6(1+2a)=90 equation: 


Simplifying
-6(1 + 2a) = 90
(1 * -6 + 2a * -6) = 90
(-6 + -12a) = 90

Solving
-6 + -12a = 90

Solving for variable 'a'.

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

Add '6' to each side of the equation.
-6 + 6 + -12a = 90 + 6

Combine like terms: -6 + 6 = 0
0 + -12a = 90 + 6
-12a = 90 + 6

Combine like terms: 90 + 6 = 96
-12a = 96

Divide each side by '-12'.
a = -8

Simplifying
a = -8

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