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Simplifying 15 + 5(x + -7) = x Reorder the terms: 15 + 5(-7 + x) = x 15 + (-7 * 5 + x * 5) = x 15 + (-35 + 5x) = x Combine like terms: 15 + -35 = -20 -20 + 5x = x Solving -20 + 5x = x Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-1x' to each side of the equation. -20 + 5x + -1x = x + -1x Combine like terms: 5x + -1x = 4x -20 + 4x = x + -1x Combine like terms: x + -1x = 0 -20 + 4x = 0 Add '20' to each side of the equation. -20 + 20 + 4x = 0 + 20 Combine like terms: -20 + 20 = 0 0 + 4x = 0 + 20 4x = 0 + 20 Combine like terms: 0 + 20 = 20 4x = 20 Divide each side by '4'. x = 5 Simplifying x = 5
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