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Simplifying 2x + 1 + -1(2 + x) = 3x + 7 2x + 1 + (2 * -1 + x * -1) = 3x + 7 2x + 1 + (-2 + -1x) = 3x + 7 Reorder the terms: 1 + -2 + 2x + -1x = 3x + 7 Combine like terms: 1 + -2 = -1 -1 + 2x + -1x = 3x + 7 Combine like terms: 2x + -1x = 1x -1 + 1x = 3x + 7 Reorder the terms: -1 + 1x = 7 + 3x Solving -1 + 1x = 7 + 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. -1 + 1x + -3x = 7 + 3x + -3x Combine like terms: 1x + -3x = -2x -1 + -2x = 7 + 3x + -3x Combine like terms: 3x + -3x = 0 -1 + -2x = 7 + 0 -1 + -2x = 7 Add '1' to each side of the equation. -1 + 1 + -2x = 7 + 1 Combine like terms: -1 + 1 = 0 0 + -2x = 7 + 1 -2x = 7 + 1 Combine like terms: 7 + 1 = 8 -2x = 8 Divide each side by '-2'. x = -4 Simplifying x = -4
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