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Simplifying 13x = (4 + x) + -3x + -1(4 + -1x) Remove parenthesis around (4 + x) 13x = 4 + x + -3x + -1(4 + -1x) 13x = 4 + x + -3x + (4 * -1 + -1x * -1) 13x = 4 + x + -3x + (-4 + 1x) Reorder the terms: 13x = 4 + -4 + x + -3x + 1x Combine like terms: 4 + -4 = 0 13x = 0 + x + -3x + 1x 13x = x + -3x + 1x Combine like terms: x + -3x = -2x 13x = -2x + 1x Combine like terms: -2x + 1x = -1x 13x = -1x Solving 13x = -1x Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add 'x' to each side of the equation. 13x + x = -1x + x Combine like terms: 13x + x = 14x 14x = -1x + x Combine like terms: -1x + x = 0 14x = 0 Divide each side by '14'. x = 0 Simplifying x = 0
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