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Simplifying 5x + -3(4x + -13) = 81 Reorder the terms: 5x + -3(-13 + 4x) = 81 5x + (-13 * -3 + 4x * -3) = 81 5x + (39 + -12x) = 81 Reorder the terms: 39 + 5x + -12x = 81 Combine like terms: 5x + -12x = -7x 39 + -7x = 81 Solving 39 + -7x = 81 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-39' to each side of the equation. 39 + -39 + -7x = 81 + -39 Combine like terms: 39 + -39 = 0 0 + -7x = 81 + -39 -7x = 81 + -39 Combine like terms: 81 + -39 = 42 -7x = 42 Divide each side by '-7'. x = -6 Simplifying x = -6
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