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Simplifying
-3 + -7x2 = -120
Solving
-3 + -7x2 = -120
Solving for variable 'x'.
Move all terms containing x to the left, all other terms to the right.
Add '3' to each side of the equation.
-3 + 3 + -7x2 = -120 + 3
Combine like terms: -3 + 3 = 0
0 + -7x2 = -120 + 3
-7x2 = -120 + 3
Combine like terms: -120 + 3 = -117
-7x2 = -117
Divide each side by '-7'.
x2 = 16.71428571
Simplifying
x2 = 16.71428571
Take the square root of each side:
x = {-4.088310863, 4.088310863}
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