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Simplifying -7x + -3(2x + -1) = 42 Reorder the terms: -7x + -3(-1 + 2x) = 42 -7x + (-1 * -3 + 2x * -3) = 42 -7x + (3 + -6x) = 42 Reorder the terms: 3 + -7x + -6x = 42 Combine like terms: -7x + -6x = -13x 3 + -13x = 42 Solving 3 + -13x = 42 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-3' to each side of the equation. 3 + -3 + -13x = 42 + -3 Combine like terms: 3 + -3 = 0 0 + -13x = 42 + -3 -13x = 42 + -3 Combine like terms: 42 + -3 = 39 -13x = 39 Divide each side by '-13'. x = -3 Simplifying x = -3
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