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Simplifying -15 + 55 = -4(x + 3) Combine like terms: -15 + 55 = 40 40 = -4(x + 3) Reorder the terms: 40 = -4(3 + x) 40 = (3 * -4 + x * -4) 40 = (-12 + -4x) Solving 40 = -12 + -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. 40 + 4x = -12 + -4x + 4x Combine like terms: -4x + 4x = 0 40 + 4x = -12 + 0 40 + 4x = -12 Add '-40' to each side of the equation. 40 + -40 + 4x = -12 + -40 Combine like terms: 40 + -40 = 0 0 + 4x = -12 + -40 4x = -12 + -40 Combine like terms: -12 + -40 = -52 4x = -52 Divide each side by '4'. x = -13 Simplifying x = -13
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