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Simplifying 15x + 6(x + -3) = 20x Reorder the terms: 15x + 6(-3 + x) = 20x 15x + (-3 * 6 + x * 6) = 20x 15x + (-18 + 6x) = 20x Reorder the terms: -18 + 15x + 6x = 20x Combine like terms: 15x + 6x = 21x -18 + 21x = 20x Solving -18 + 21x = 20x Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-20x' to each side of the equation. -18 + 21x + -20x = 20x + -20x Combine like terms: 21x + -20x = 1x -18 + 1x = 20x + -20x Combine like terms: 20x + -20x = 0 -18 + 1x = 0 Add '18' to each side of the equation. -18 + 18 + 1x = 0 + 18 Combine like terms: -18 + 18 = 0 0 + 1x = 0 + 18 1x = 0 + 18 Combine like terms: 0 + 18 = 18 1x = 18 Divide each side by '1'. x = 18 Simplifying x = 18
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