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Simplifying -2x + 7(3x + -1) = 31 Reorder the terms: -2x + 7(-1 + 3x) = 31 -2x + (-1 * 7 + 3x * 7) = 31 -2x + (-7 + 21x) = 31 Reorder the terms: -7 + -2x + 21x = 31 Combine like terms: -2x + 21x = 19x -7 + 19x = 31 Solving -7 + 19x = 31 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '7' to each side of the equation. -7 + 7 + 19x = 31 + 7 Combine like terms: -7 + 7 = 0 0 + 19x = 31 + 7 19x = 31 + 7 Combine like terms: 31 + 7 = 38 19x = 38 Divide each side by '19'. x = 2 Simplifying x = 2
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