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Simplifying -7x + 7(4x + -15) = 126 Reorder the terms: -7x + 7(-15 + 4x) = 126 -7x + (-15 * 7 + 4x * 7) = 126 -7x + (-105 + 28x) = 126 Reorder the terms: -105 + -7x + 28x = 126 Combine like terms: -7x + 28x = 21x -105 + 21x = 126 Solving -105 + 21x = 126 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 + 21x = 126 + 105 Combine like terms: -105 + 105 = 0 0 + 21x = 126 + 105 21x = 126 + 105 Combine like terms: 126 + 105 = 231 21x = 231 Divide each side by '21'. x = 11 Simplifying x = 11
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