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Simplifying -12(x + 3) + x + 15 = 4 + -13x Reorder the terms: -12(3 + x) + x + 15 = 4 + -13x (3 * -12 + x * -12) + x + 15 = 4 + -13x (-36 + -12x) + x + 15 = 4 + -13x Reorder the terms: -36 + 15 + -12x + x = 4 + -13x Combine like terms: -36 + 15 = -21 -21 + -12x + x = 4 + -13x Combine like terms: -12x + x = -11x -21 + -11x = 4 + -13x Solving -21 + -11x = 4 + -13x Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '13x' to each side of the equation. -21 + -11x + 13x = 4 + -13x + 13x Combine like terms: -11x + 13x = 2x -21 + 2x = 4 + -13x + 13x Combine like terms: -13x + 13x = 0 -21 + 2x = 4 + 0 -21 + 2x = 4 Add '21' to each side of the equation. -21 + 21 + 2x = 4 + 21 Combine like terms: -21 + 21 = 0 0 + 2x = 4 + 21 2x = 4 + 21 Combine like terms: 4 + 21 = 25 2x = 25 Divide each side by '2'. x = 12.5 Simplifying x = 12.5
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