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Simplifying x + 3(x + -7) = 15 Reorder the terms: x + 3(-7 + x) = 15 x + (-7 * 3 + x * 3) = 15 x + (-21 + 3x) = 15 Reorder the terms: -21 + x + 3x = 15 Combine like terms: x + 3x = 4x -21 + 4x = 15 Solving -21 + 4x = 15 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '21' to each side of the equation. -21 + 21 + 4x = 15 + 21 Combine like terms: -21 + 21 = 0 0 + 4x = 15 + 21 4x = 15 + 21 Combine like terms: 15 + 21 = 36 4x = 36 Divide each side by '4'. x = 9 Simplifying x = 9
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