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Simplifying
3x2 + -12 = 135
Reorder the terms:
-12 + 3x2 = 135
Solving
-12 + 3x2 = 135
Solving for variable 'x'.
Move all terms containing x to the left, all other terms to the right.
Add '12' to each side of the equation.
-12 + 12 + 3x2 = 135 + 12
Combine like terms: -12 + 12 = 0
0 + 3x2 = 135 + 12
3x2 = 135 + 12
Combine like terms: 135 + 12 = 147
3x2 = 147
Divide each side by '3'.
x2 = 49
Simplifying
x2 = 49
Take the square root of each side:
x = {-7, 7}
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