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Simplifying
-10x2 + 40 = 0
Reorder the terms:
40 + -10x2 = 0
Solving
40 + -10x2 = 0
Solving for variable 'x'.
Move all terms containing x to the left, all other terms to the right.
Add '-40' to each side of the equation.
40 + -40 + -10x2 = 0 + -40
Combine like terms: 40 + -40 = 0
0 + -10x2 = 0 + -40
-10x2 = 0 + -40
Combine like terms: 0 + -40 = -40
-10x2 = -40
Divide each side by '-10'.
x2 = 4
Simplifying
x2 = 4
Take the square root of each side:
x = {-2, 2}
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