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Simplifying 12 = 5 + x + (x + -1) Reorder the terms: 12 = 5 + x + (-1 + x) Remove parenthesis around (-1 + x) 12 = 5 + x + -1 + x Reorder the terms: 12 = 5 + -1 + x + x Combine like terms: 5 + -1 = 4 12 = 4 + x + x Combine like terms: x + x = 2x 12 = 4 + 2x Solving 12 = 4 + 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. 12 + -2x = 4 + 2x + -2x Combine like terms: 2x + -2x = 0 12 + -2x = 4 + 0 12 + -2x = 4 Add '-12' to each side of the equation. 12 + -12 + -2x = 4 + -12 Combine like terms: 12 + -12 = 0 0 + -2x = 4 + -12 -2x = 4 + -12 Combine like terms: 4 + -12 = -8 -2x = -8 Divide each side by '-2'. x = 4 Simplifying x = 4
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