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Simplifying 63 = x + (x + -7) Reorder the terms: 63 = x + (-7 + x) Remove parenthesis around (-7 + x) 63 = x + -7 + x Reorder the terms: 63 = -7 + x + x Combine like terms: x + x = 2x 63 = -7 + 2x Solving 63 = -7 + 2x Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-2x' to each side of the equation. 63 + -2x = -7 + 2x + -2x Combine like terms: 2x + -2x = 0 63 + -2x = -7 + 0 63 + -2x = -7 Add '-63' to each side of the equation. 63 + -63 + -2x = -7 + -63 Combine like terms: 63 + -63 = 0 0 + -2x = -7 + -63 -2x = -7 + -63 Combine like terms: -7 + -63 = -70 -2x = -70 Divide each side by '-2'. x = 35 Simplifying x = 35
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