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Simplifying 18 = -3(2x + 1) + 7x Reorder the terms: 18 = -3(1 + 2x) + 7x 18 = (1 * -3 + 2x * -3) + 7x 18 = (-3 + -6x) + 7x Combine like terms: -6x + 7x = 1x 18 = -3 + 1x Solving 18 = -3 + 1x Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-1x' to each side of the equation. 18 + -1x = -3 + 1x + -1x Combine like terms: 1x + -1x = 0 18 + -1x = -3 + 0 18 + -1x = -3 Add '-18' to each side of the equation. 18 + -18 + -1x = -3 + -18 Combine like terms: 18 + -18 = 0 0 + -1x = -3 + -18 -1x = -3 + -18 Combine like terms: -3 + -18 = -21 -1x = -21 Divide each side by '-1'. x = 21 Simplifying x = 21
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