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Simplifying -2x + 7(1 + -1(-3x)) = -19 + 3x Remove parenthesis around (-3x) -2x + 7(1 + -1 * -3x) = -19 + 3x Multiply -1 * -3 -2x + 7(1 + 3x) = -19 + 3x -2x + (1 * 7 + 3x * 7) = -19 + 3x -2x + (7 + 21x) = -19 + 3x Reorder the terms: 7 + -2x + 21x = -19 + 3x Combine like terms: -2x + 21x = 19x 7 + 19x = -19 + 3x Solving 7 + 19x = -19 + 3x Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-3x' to each side of the equation. 7 + 19x + -3x = -19 + 3x + -3x Combine like terms: 19x + -3x = 16x 7 + 16x = -19 + 3x + -3x Combine like terms: 3x + -3x = 0 7 + 16x = -19 + 0 7 + 16x = -19 Add '-7' to each side of the equation. 7 + -7 + 16x = -19 + -7 Combine like terms: 7 + -7 = 0 0 + 16x = -19 + -7 16x = -19 + -7 Combine like terms: -19 + -7 = -26 16x = -26 Divide each side by '16'. x = -1.625 Simplifying x = -1.625
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