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Simplifying 90 = x + (x + -40) Reorder the terms: 90 = x + (-40 + x) Remove parenthesis around (-40 + x) 90 = x + -40 + x Reorder the terms: 90 = -40 + x + x Combine like terms: x + x = 2x 90 = -40 + 2x Solving 90 = -40 + 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 + -2x = -40 + 2x + -2x Combine like terms: 2x + -2x = 0 90 + -2x = -40 + 0 90 + -2x = -40 Add '-90' to each side of the equation. 90 + -90 + -2x = -40 + -90 Combine like terms: 90 + -90 = 0 0 + -2x = -40 + -90 -2x = -40 + -90 Combine like terms: -40 + -90 = -130 -2x = -130 Divide each side by '-2'. x = 65 Simplifying x = 65
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