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Simplifying
8x2 + -55 = 7
Reorder the terms:
-55 + 8x2 = 7
Solving
-55 + 8x2 = 7
Solving for variable 'x'.
Move all terms containing x to the left, all other terms to the right.
Add '55' to each side of the equation.
-55 + 55 + 8x2 = 7 + 55
Combine like terms: -55 + 55 = 0
0 + 8x2 = 7 + 55
8x2 = 7 + 55
Combine like terms: 7 + 55 = 62
8x2 = 62
Divide each side by '8'.
x2 = 7.75
Simplifying
x2 = 7.75
Take the square root of each side:
x = {-2.783882181, 2.783882181}
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