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Simplifying 90 + -1x = 20 + x Solving 90 + -1x = 20 + x Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-1x' to each side of the equation. 90 + -1x + -1x = 20 + x + -1x Combine like terms: -1x + -1x = -2x 90 + -2x = 20 + x + -1x Combine like terms: x + -1x = 0 90 + -2x = 20 + 0 90 + -2x = 20 Add '-90' to each side of the equation. 90 + -90 + -2x = 20 + -90 Combine like terms: 90 + -90 = 0 0 + -2x = 20 + -90 -2x = 20 + -90 Combine like terms: 20 + -90 = -70 -2x = -70 Divide each side by '-2'. x = 35 Simplifying x = 35
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