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Simplifying -2x + -3 + -1(4x + -7) = 21 Reorder the terms: -2x + -3 + -1(-7 + 4x) = 21 -2x + -3 + (-7 * -1 + 4x * -1) = 21 -2x + -3 + (7 + -4x) = 21 Reorder the terms: -3 + 7 + -2x + -4x = 21 Combine like terms: -3 + 7 = 4 4 + -2x + -4x = 21 Combine like terms: -2x + -4x = -6x 4 + -6x = 21 Solving 4 + -6x = 21 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-4' to each side of the equation. 4 + -4 + -6x = 21 + -4 Combine like terms: 4 + -4 = 0 0 + -6x = 21 + -4 -6x = 21 + -4 Combine like terms: 21 + -4 = 17 -6x = 17 Divide each side by '-6'. x = -2.833333333 Simplifying x = -2.833333333
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