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Simplifying 7(x + -2) = 4(x + 1) + -21 Reorder the terms: 7(-2 + x) = 4(x + 1) + -21 (-2 * 7 + x * 7) = 4(x + 1) + -21 (-14 + 7x) = 4(x + 1) + -21 Reorder the terms: -14 + 7x = 4(1 + x) + -21 -14 + 7x = (1 * 4 + x * 4) + -21 -14 + 7x = (4 + 4x) + -21 Reorder the terms: -14 + 7x = 4 + -21 + 4x Combine like terms: 4 + -21 = -17 -14 + 7x = -17 + 4x Solving -14 + 7x = -17 + 4x Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-4x' to each side of the equation. -14 + 7x + -4x = -17 + 4x + -4x Combine like terms: 7x + -4x = 3x -14 + 3x = -17 + 4x + -4x Combine like terms: 4x + -4x = 0 -14 + 3x = -17 + 0 -14 + 3x = -17 Add '14' to each side of the equation. -14 + 14 + 3x = -17 + 14 Combine like terms: -14 + 14 = 0 0 + 3x = -17 + 14 3x = -17 + 14 Combine like terms: -17 + 14 = -3 3x = -3 Divide each side by '3'. x = -1 Simplifying x = -1
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