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Simplifying x + (35 + x) + (-40 + 3x) = 690 Remove parenthesis around (35 + x) x + 35 + x + (-40 + 3x) = 690 Remove parenthesis around (-40 + 3x) x + 35 + x + -40 + 3x = 690 Reorder the terms: 35 + -40 + x + x + 3x = 690 Combine like terms: 35 + -40 = -5 -5 + x + x + 3x = 690 Combine like terms: x + x = 2x -5 + 2x + 3x = 690 Combine like terms: 2x + 3x = 5x -5 + 5x = 690 Solving -5 + 5x = 690 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '5' to each side of the equation. -5 + 5 + 5x = 690 + 5 Combine like terms: -5 + 5 = 0 0 + 5x = 690 + 5 5x = 690 + 5 Combine like terms: 690 + 5 = 695 5x = 695 Divide each side by '5'. x = 139 Simplifying x = 139
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