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Simplifying (2x + -7) + (x + 4) = 42 Reorder the terms: (-7 + 2x) + (x + 4) = 42 Remove parenthesis around (-7 + 2x) -7 + 2x + (x + 4) = 42 Reorder the terms: -7 + 2x + (4 + x) = 42 Remove parenthesis around (4 + x) -7 + 2x + 4 + x = 42 Reorder the terms: -7 + 4 + 2x + x = 42 Combine like terms: -7 + 4 = -3 -3 + 2x + x = 42 Combine like terms: 2x + x = 3x -3 + 3x = 42 Solving -3 + 3x = 42 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '3' to each side of the equation. -3 + 3 + 3x = 42 + 3 Combine like terms: -3 + 3 = 0 0 + 3x = 42 + 3 3x = 42 + 3 Combine like terms: 42 + 3 = 45 3x = 45 Divide each side by '3'. x = 15 Simplifying x = 15
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