13(12-3x)-3(9+15x)=213

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Solution for 13(12-3x)-3(9+15x)=213 equation: 


Simplifying
13(12 + -3x) + -3(9 + 15x) = 213
(12 * 13 + -3x * 13) + -3(9 + 15x) = 213
(156 + -39x) + -3(9 + 15x) = 213
156 + -39x + (9 * -3 + 15x * -3) = 213
156 + -39x + (-27 + -45x) = 213

Reorder the terms:
156 + -27 + -39x + -45x = 213

Combine like terms: 156 + -27 = 129
129 + -39x + -45x = 213

Combine like terms: -39x + -45x = -84x
129 + -84x = 213

Solving
129 + -84x = 213

Solving for variable 'x'.

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

Add '-129' to each side of the equation.
129 + -129 + -84x = 213 + -129

Combine like terms: 129 + -129 = 0
0 + -84x = 213 + -129
-84x = 213 + -129

Combine like terms: 213 + -129 = 84
-84x = 84

Divide each side by '-84'.
x = -1

Simplifying
x = -1

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