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Simplifying 7x + 2(7x + -12) = 81 Reorder the terms: 7x + 2(-12 + 7x) = 81 7x + (-12 * 2 + 7x * 2) = 81 7x + (-24 + 14x) = 81 Reorder the terms: -24 + 7x + 14x = 81 Combine like terms: 7x + 14x = 21x -24 + 21x = 81 Solving -24 + 21x = 81 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '24' to each side of the equation. -24 + 24 + 21x = 81 + 24 Combine like terms: -24 + 24 = 0 0 + 21x = 81 + 24 21x = 81 + 24 Combine like terms: 81 + 24 = 105 21x = 105 Divide each side by '21'. x = 5 Simplifying x = 5
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