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Simplifying -7x + 5x + -1 = -3(7 + -1x) Reorder the terms: -1 + -7x + 5x = -3(7 + -1x) Combine like terms: -7x + 5x = -2x -1 + -2x = -3(7 + -1x) -1 + -2x = (7 * -3 + -1x * -3) -1 + -2x = (-21 + 3x) Solving -1 + -2x = -21 + 3x Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-3x' to each side of the equation. -1 + -2x + -3x = -21 + 3x + -3x Combine like terms: -2x + -3x = -5x -1 + -5x = -21 + 3x + -3x Combine like terms: 3x + -3x = 0 -1 + -5x = -21 + 0 -1 + -5x = -21 Add '1' to each side of the equation. -1 + 1 + -5x = -21 + 1 Combine like terms: -1 + 1 = 0 0 + -5x = -21 + 1 -5x = -21 + 1 Combine like terms: -21 + 1 = -20 -5x = -20 Divide each side by '-5'. x = 4 Simplifying x = 4
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