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Simplifying
7 = 15 + -2x2
Solving
7 = 15 + -2x2
Solving for variable 'x'.
Move all terms containing x to the left, all other terms to the right.
Add '2x2' to each side of the equation.
7 + 2x2 = 15 + -2x2 + 2x2
Combine like terms: -2x2 + 2x2 = 0
7 + 2x2 = 15 + 0
7 + 2x2 = 15
Add '-7' to each side of the equation.
7 + -7 + 2x2 = 15 + -7
Combine like terms: 7 + -7 = 0
0 + 2x2 = 15 + -7
2x2 = 15 + -7
Combine like terms: 15 + -7 = 8
2x2 = 8
Divide each side by '2'.
x2 = 4
Simplifying
x2 = 4
Take the square root of each side:
x = {-2, 2}
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