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Simplifying
20 = 40 + -5x2
Solving
20 = 40 + -5x2
Solving for variable 'x'.
Move all terms containing x to the left, all other terms to the right.
Add '5x2' to each side of the equation.
20 + 5x2 = 40 + -5x2 + 5x2
Combine like terms: -5x2 + 5x2 = 0
20 + 5x2 = 40 + 0
20 + 5x2 = 40
Add '-20' to each side of the equation.
20 + -20 + 5x2 = 40 + -20
Combine like terms: 20 + -20 = 0
0 + 5x2 = 40 + -20
5x2 = 40 + -20
Combine like terms: 40 + -20 = 20
5x2 = 20
Divide each side by '5'.
x2 = 4
Simplifying
x2 = 4
Take the square root of each side:
x = {-2, 2}
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