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Simplifying 144 = -21(x + 5) Reorder the terms: 144 = -21(5 + x) 144 = (5 * -21 + x * -21) 144 = (-105 + -21x) Solving 144 = -105 + -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. 144 + 21x = -105 + -21x + 21x Combine like terms: -21x + 21x = 0 144 + 21x = -105 + 0 144 + 21x = -105 Add '-144' to each side of the equation. 144 + -144 + 21x = -105 + -144 Combine like terms: 144 + -144 = 0 0 + 21x = -105 + -144 21x = -105 + -144 Combine like terms: -105 + -144 = -249 21x = -249 Divide each side by '21'. x = -11.85714286 Simplifying x = -11.85714286
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