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Simplifying 13 + -1(7 + -1x) = 3x 13 + (7 * -1 + -1x * -1) = 3x 13 + (-7 + 1x) = 3x Combine like terms: 13 + -7 = 6 6 + 1x = 3x Solving 6 + 1x = 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. 6 + 1x + -3x = 3x + -3x Combine like terms: 1x + -3x = -2x 6 + -2x = 3x + -3x Combine like terms: 3x + -3x = 0 6 + -2x = 0 Add '-6' to each side of the equation. 6 + -6 + -2x = 0 + -6 Combine like terms: 6 + -6 = 0 0 + -2x = 0 + -6 -2x = 0 + -6 Combine like terms: 0 + -6 = -6 -2x = -6 Divide each side by '-2'. x = 3 Simplifying x = 3
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