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Simplifying 20 = -3(2x + 1) + 7x Reorder the terms: 20 = -3(1 + 2x) + 7x 20 = (1 * -3 + 2x * -3) + 7x 20 = (-3 + -6x) + 7x Combine like terms: -6x + 7x = 1x 20 = -3 + 1x Solving 20 = -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. 20 + -1x = -3 + 1x + -1x Combine like terms: 1x + -1x = 0 20 + -1x = -3 + 0 20 + -1x = -3 Add '-20' to each side of the equation. 20 + -20 + -1x = -3 + -20 Combine like terms: 20 + -20 = 0 0 + -1x = -3 + -20 -1x = -3 + -20 Combine like terms: -3 + -20 = -23 -1x = -23 Divide each side by '-1'. x = 23 Simplifying x = 23
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