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Simplifying
-3x2 + 20 = -7
Reorder the terms:
20 + -3x2 = -7
Solving
20 + -3x2 = -7
Solving for variable 'x'.
Move all terms containing x to the left, all other terms to the right.
Add '-20' to each side of the equation.
20 + -20 + -3x2 = -7 + -20
Combine like terms: 20 + -20 = 0
0 + -3x2 = -7 + -20
-3x2 = -7 + -20
Combine like terms: -7 + -20 = -27
-3x2 = -27
Divide each side by '-3'.
x2 = 9
Simplifying
x2 = 9
Take the square root of each side:
x = {-3, 3}
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