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Simplifying 40 = 15 + (x + -7) + x Reorder the terms: 40 = 15 + (-7 + x) + x Remove parenthesis around (-7 + x) 40 = 15 + -7 + x + x Combine like terms: 15 + -7 = 8 40 = 8 + x + x Combine like terms: x + x = 2x 40 = 8 + 2x Solving 40 = 8 + 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. 40 + -2x = 8 + 2x + -2x Combine like terms: 2x + -2x = 0 40 + -2x = 8 + 0 40 + -2x = 8 Add '-40' to each side of the equation. 40 + -40 + -2x = 8 + -40 Combine like terms: 40 + -40 = 0 0 + -2x = 8 + -40 -2x = 8 + -40 Combine like terms: 8 + -40 = -32 -2x = -32 Divide each side by '-2'. x = 16 Simplifying x = 16
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