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Simplifying x + x + (x + -3) = 420 Reorder the terms: x + x + (-3 + x) = 420 Remove parenthesis around (-3 + x) x + x + -3 + x = 420 Reorder the terms: -3 + x + x + x = 420 Combine like terms: x + x = 2x -3 + 2x + x = 420 Combine like terms: 2x + x = 3x -3 + 3x = 420 Solving -3 + 3x = 420 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '3' to each side of the equation. -3 + 3 + 3x = 420 + 3 Combine like terms: -3 + 3 = 0 0 + 3x = 420 + 3 3x = 420 + 3 Combine like terms: 420 + 3 = 423 3x = 423 Divide each side by '3'. x = 141 Simplifying x = 141
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