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Simplifying 13x + -1(6x + -7) = 49 Reorder the terms: 13x + -1(-7 + 6x) = 49 13x + (-7 * -1 + 6x * -1) = 49 13x + (7 + -6x) = 49 Reorder the terms: 7 + 13x + -6x = 49 Combine like terms: 13x + -6x = 7x 7 + 7x = 49 Solving 7 + 7x = 49 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-7' to each side of the equation. 7 + -7 + 7x = 49 + -7 Combine like terms: 7 + -7 = 0 0 + 7x = 49 + -7 7x = 49 + -7 Combine like terms: 49 + -7 = 42 7x = 42 Divide each side by '7'. x = 6 Simplifying x = 6
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