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Simplifying 20 = -3x + 7(x + 4) Reorder the terms: 20 = -3x + 7(4 + x) 20 = -3x + (4 * 7 + x * 7) 20 = -3x + (28 + 7x) Reorder the terms: 20 = 28 + -3x + 7x Combine like terms: -3x + 7x = 4x 20 = 28 + 4x Solving 20 = 28 + 4x Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-4x' to each side of the equation. 20 + -4x = 28 + 4x + -4x Combine like terms: 4x + -4x = 0 20 + -4x = 28 + 0 20 + -4x = 28 Add '-20' to each side of the equation. 20 + -20 + -4x = 28 + -20 Combine like terms: 20 + -20 = 0 0 + -4x = 28 + -20 -4x = 28 + -20 Combine like terms: 28 + -20 = 8 -4x = 8 Divide each side by '-4'. x = -2 Simplifying x = -2
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