-10(10+a)=-170

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Solution for -10(10+a)=-170 equation: 


Simplifying
-10(10 + a) = -170
(10 * -10 + a * -10) = -170
(-100 + -10a) = -170

Solving
-100 + -10a = -170

Solving for variable 'a'.

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

Add '100' to each side of the equation.
-100 + 100 + -10a = -170 + 100

Combine like terms: -100 + 100 = 0
0 + -10a = -170 + 100
-10a = -170 + 100

Combine like terms: -170 + 100 = -70
-10a = -70

Divide each side by '-10'.
a = 7

Simplifying
a = 7

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