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Simplifying 3x + (x + -8) = 40 Reorder the terms: 3x + (-8 + x) = 40 Remove parenthesis around (-8 + x) 3x + -8 + x = 40 Reorder the terms: -8 + 3x + x = 40 Combine like terms: 3x + x = 4x -8 + 4x = 40 Solving -8 + 4x = 40 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '8' to each side of the equation. -8 + 8 + 4x = 40 + 8 Combine like terms: -8 + 8 = 0 0 + 4x = 40 + 8 4x = 40 + 8 Combine like terms: 40 + 8 = 48 4x = 48 Divide each side by '4'. x = 12 Simplifying x = 12
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