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Simplifying 3(x + -7) + 2x = x + -1 Reorder the terms: 3(-7 + x) + 2x = x + -1 (-7 * 3 + x * 3) + 2x = x + -1 (-21 + 3x) + 2x = x + -1 Combine like terms: 3x + 2x = 5x -21 + 5x = x + -1 Reorder the terms: -21 + 5x = -1 + x Solving -21 + 5x = -1 + x Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-1x' to each side of the equation. -21 + 5x + -1x = -1 + x + -1x Combine like terms: 5x + -1x = 4x -21 + 4x = -1 + x + -1x Combine like terms: x + -1x = 0 -21 + 4x = -1 + 0 -21 + 4x = -1 Add '21' to each side of the equation. -21 + 21 + 4x = -1 + 21 Combine like terms: -21 + 21 = 0 0 + 4x = -1 + 21 4x = -1 + 21 Combine like terms: -1 + 21 = 20 4x = 20 Divide each side by '4'. x = 5 Simplifying x = 5
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