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Simplifying 90 + -1x = 2x + 42 Reorder the terms: 90 + -1x = 42 + 2x Solving 90 + -1x = 42 + 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. 90 + -1x + -2x = 42 + 2x + -2x Combine like terms: -1x + -2x = -3x 90 + -3x = 42 + 2x + -2x Combine like terms: 2x + -2x = 0 90 + -3x = 42 + 0 90 + -3x = 42 Add '-90' to each side of the equation. 90 + -90 + -3x = 42 + -90 Combine like terms: 90 + -90 = 0 0 + -3x = 42 + -90 -3x = 42 + -90 Combine like terms: 42 + -90 = -48 -3x = -48 Divide each side by '-3'. x = 16 Simplifying x = 16
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