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Simplifying 15x + 27(x + -3) = 129 Reorder the terms: 15x + 27(-3 + x) = 129 15x + (-3 * 27 + x * 27) = 129 15x + (-81 + 27x) = 129 Reorder the terms: -81 + 15x + 27x = 129 Combine like terms: 15x + 27x = 42x -81 + 42x = 129 Solving -81 + 42x = 129 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '81' to each side of the equation. -81 + 81 + 42x = 129 + 81 Combine like terms: -81 + 81 = 0 0 + 42x = 129 + 81 42x = 129 + 81 Combine like terms: 129 + 81 = 210 42x = 210 Divide each side by '42'. x = 5 Simplifying x = 5
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