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Simplifying x + (x + -40) = 90 Reorder the terms: x + (-40 + x) = 90 Remove parenthesis around (-40 + x) x + -40 + x = 90 Reorder the terms: -40 + x + x = 90 Combine like terms: x + x = 2x -40 + 2x = 90 Solving -40 + 2x = 90 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '40' to each side of the equation. -40 + 40 + 2x = 90 + 40 Combine like terms: -40 + 40 = 0 0 + 2x = 90 + 40 2x = 90 + 40 Combine like terms: 90 + 40 = 130 2x = 130 Divide each side by '2'. x = 65 Simplifying x = 65
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