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Simplifying (2x + -1) + (5x + -42) = 90 Reorder the terms: (-1 + 2x) + (5x + -42) = 90 Remove parenthesis around (-1 + 2x) -1 + 2x + (5x + -42) = 90 Reorder the terms: -1 + 2x + (-42 + 5x) = 90 Remove parenthesis around (-42 + 5x) -1 + 2x + -42 + 5x = 90 Reorder the terms: -1 + -42 + 2x + 5x = 90 Combine like terms: -1 + -42 = -43 -43 + 2x + 5x = 90 Combine like terms: 2x + 5x = 7x -43 + 7x = 90 Solving -43 + 7x = 90 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '43' to each side of the equation. -43 + 43 + 7x = 90 + 43 Combine like terms: -43 + 43 = 0 0 + 7x = 90 + 43 7x = 90 + 43 Combine like terms: 90 + 43 = 133 7x = 133 Divide each side by '7'. x = 19 Simplifying x = 19
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