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Simplifying 2x + -7(x + -3) = 81 Reorder the terms: 2x + -7(-3 + x) = 81 2x + (-3 * -7 + x * -7) = 81 2x + (21 + -7x) = 81 Reorder the terms: 21 + 2x + -7x = 81 Combine like terms: 2x + -7x = -5x 21 + -5x = 81 Solving 21 + -5x = 81 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-21' to each side of the equation. 21 + -21 + -5x = 81 + -21 Combine like terms: 21 + -21 = 0 0 + -5x = 81 + -21 -5x = 81 + -21 Combine like terms: 81 + -21 = 60 -5x = 60 Divide each side by '-5'. x = -12 Simplifying x = -12
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