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Simplifying
2x2 + -87 = 11
Reorder the terms:
-87 + 2x2 = 11
Solving
-87 + 2x2 = 11
Solving for variable 'x'.
Move all terms containing x to the left, all other terms to the right.
Add '87' to each side of the equation.
-87 + 87 + 2x2 = 11 + 87
Combine like terms: -87 + 87 = 0
0 + 2x2 = 11 + 87
2x2 = 11 + 87
Combine like terms: 11 + 87 = 98
2x2 = 98
Divide each side by '2'.
x2 = 49
Simplifying
x2 = 49
Take the square root of each side:
x = {-7, 7}
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