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Simplifying 115 = -4 + 7(-3x + 8) Reorder the terms: 115 = -4 + 7(8 + -3x) 115 = -4 + (8 * 7 + -3x * 7) 115 = -4 + (56 + -21x) Combine like terms: -4 + 56 = 52 115 = 52 + -21x Solving 115 = 52 + -21x Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '21x' to each side of the equation. 115 + 21x = 52 + -21x + 21x Combine like terms: -21x + 21x = 0 115 + 21x = 52 + 0 115 + 21x = 52 Add '-115' to each side of the equation. 115 + -115 + 21x = 52 + -115 Combine like terms: 115 + -115 = 0 0 + 21x = 52 + -115 21x = 52 + -115 Combine like terms: 52 + -115 = -63 21x = -63 Divide each side by '21'. x = -3 Simplifying x = -3
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