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Simplifying x + 1 + -3(x + 3) = 15 Reorder the terms: x + 1 + -3(3 + x) = 15 x + 1 + (3 * -3 + x * -3) = 15 x + 1 + (-9 + -3x) = 15 Reorder the terms: 1 + -9 + x + -3x = 15 Combine like terms: 1 + -9 = -8 -8 + x + -3x = 15 Combine like terms: x + -3x = -2x -8 + -2x = 15 Solving -8 + -2x = 15 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '8' to each side of the equation. -8 + 8 + -2x = 15 + 8 Combine like terms: -8 + 8 = 0 0 + -2x = 15 + 8 -2x = 15 + 8 Combine like terms: 15 + 8 = 23 -2x = 23 Divide each side by '-2'. x = -11.5 Simplifying x = -11.5
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