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Simplifying 20 = 5x + 3(x + -12) Reorder the terms: 20 = 5x + 3(-12 + x) 20 = 5x + (-12 * 3 + x * 3) 20 = 5x + (-36 + 3x) Reorder the terms: 20 = -36 + 5x + 3x Combine like terms: 5x + 3x = 8x 20 = -36 + 8x Solving 20 = -36 + 8x Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-8x' to each side of the equation. 20 + -8x = -36 + 8x + -8x Combine like terms: 8x + -8x = 0 20 + -8x = -36 + 0 20 + -8x = -36 Add '-20' to each side of the equation. 20 + -20 + -8x = -36 + -20 Combine like terms: 20 + -20 = 0 0 + -8x = -36 + -20 -8x = -36 + -20 Combine like terms: -36 + -20 = -56 -8x = -56 Divide each side by '-8'. x = 7 Simplifying x = 7
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