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Simplifying -7x + 4(-3x + 7) = -105 Reorder the terms: -7x + 4(7 + -3x) = -105 -7x + (7 * 4 + -3x * 4) = -105 -7x + (28 + -12x) = -105 Reorder the terms: 28 + -7x + -12x = -105 Combine like terms: -7x + -12x = -19x 28 + -19x = -105 Solving 28 + -19x = -105 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-28' to each side of the equation. 28 + -28 + -19x = -105 + -28 Combine like terms: 28 + -28 = 0 0 + -19x = -105 + -28 -19x = -105 + -28 Combine like terms: -105 + -28 = -133 -19x = -133 Divide each side by '-19'. x = 7 Simplifying x = 7
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