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Simplifying -20 = 3x + 7(2x + -15) Reorder the terms: -20 = 3x + 7(-15 + 2x) -20 = 3x + (-15 * 7 + 2x * 7) -20 = 3x + (-105 + 14x) Reorder the terms: -20 = -105 + 3x + 14x Combine like terms: 3x + 14x = 17x -20 = -105 + 17x Solving -20 = -105 + 17x Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-17x' to each side of the equation. -20 + -17x = -105 + 17x + -17x Combine like terms: 17x + -17x = 0 -20 + -17x = -105 + 0 -20 + -17x = -105 Add '20' to each side of the equation. -20 + 20 + -17x = -105 + 20 Combine like terms: -20 + 20 = 0 0 + -17x = -105 + 20 -17x = -105 + 20 Combine like terms: -105 + 20 = -85 -17x = -85 Divide each side by '-17'. x = 5 Simplifying x = 5
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