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Simplifying 2x + -18 = 21 + -1x Reorder the terms: -18 + 2x = 21 + -1x Solving -18 + 2x = 21 + -1x Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add 'x' to each side of the equation. -18 + 2x + x = 21 + -1x + x Combine like terms: 2x + x = 3x -18 + 3x = 21 + -1x + x Combine like terms: -1x + x = 0 -18 + 3x = 21 + 0 -18 + 3x = 21 Add '18' to each side of the equation. -18 + 18 + 3x = 21 + 18 Combine like terms: -18 + 18 = 0 0 + 3x = 21 + 18 3x = 21 + 18 Combine like terms: 21 + 18 = 39 3x = 39 Divide each side by '3'. x = 13 Simplifying x = 13
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