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Simplifying (2x + -3) + (x + 7) = 42 Reorder the terms: (-3 + 2x) + (x + 7) = 42 Remove parenthesis around (-3 + 2x) -3 + 2x + (x + 7) = 42 Reorder the terms: -3 + 2x + (7 + x) = 42 Remove parenthesis around (7 + x) -3 + 2x + 7 + x = 42 Reorder the terms: -3 + 7 + 2x + x = 42 Combine like terms: -3 + 7 = 4 4 + 2x + x = 42 Combine like terms: 2x + x = 3x 4 + 3x = 42 Solving 4 + 3x = 42 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-4' to each side of the equation. 4 + -4 + 3x = 42 + -4 Combine like terms: 4 + -4 = 0 0 + 3x = 42 + -4 3x = 42 + -4 Combine like terms: 42 + -4 = 38 3x = 38 Divide each side by '3'. x = 12.66666667 Simplifying x = 12.66666667
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