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Simplifying (x + 20) + (3x + -26) = 684 Reorder the terms: (20 + x) + (3x + -26) = 684 Remove parenthesis around (20 + x) 20 + x + (3x + -26) = 684 Reorder the terms: 20 + x + (-26 + 3x) = 684 Remove parenthesis around (-26 + 3x) 20 + x + -26 + 3x = 684 Reorder the terms: 20 + -26 + x + 3x = 684 Combine like terms: 20 + -26 = -6 -6 + x + 3x = 684 Combine like terms: x + 3x = 4x -6 + 4x = 684 Solving -6 + 4x = 684 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '6' to each side of the equation. -6 + 6 + 4x = 684 + 6 Combine like terms: -6 + 6 = 0 0 + 4x = 684 + 6 4x = 684 + 6 Combine like terms: 684 + 6 = 690 4x = 690 Divide each side by '4'. x = 172.5 Simplifying x = 172.5
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