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Simplifying 15x + 21(x + -5) = 219 Reorder the terms: 15x + 21(-5 + x) = 219 15x + (-5 * 21 + x * 21) = 219 15x + (-105 + 21x) = 219 Reorder the terms: -105 + 15x + 21x = 219 Combine like terms: 15x + 21x = 36x -105 + 36x = 219 Solving -105 + 36x = 219 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '105' to each side of the equation. -105 + 105 + 36x = 219 + 105 Combine like terms: -105 + 105 = 0 0 + 36x = 219 + 105 36x = 219 + 105 Combine like terms: 219 + 105 = 324 36x = 324 Divide each side by '36'. x = 9 Simplifying x = 9
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