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Simplifying 3(x + 7) = 2(x + -1(4 + -1x)) Reorder the terms: 3(7 + x) = 2(x + -1(4 + -1x)) (7 * 3 + x * 3) = 2(x + -1(4 + -1x)) (21 + 3x) = 2(x + -1(4 + -1x)) 21 + 3x = 2(x + (4 * -1 + -1x * -1)) 21 + 3x = 2(x + (-4 + 1x)) Reorder the terms: 21 + 3x = 2(-4 + x + 1x) Combine like terms: x + 1x = 2x 21 + 3x = 2(-4 + 2x) 21 + 3x = (-4 * 2 + 2x * 2) 21 + 3x = (-8 + 4x) Solving 21 + 3x = -8 + 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. 21 + 3x + -4x = -8 + 4x + -4x Combine like terms: 3x + -4x = -1x 21 + -1x = -8 + 4x + -4x Combine like terms: 4x + -4x = 0 21 + -1x = -8 + 0 21 + -1x = -8 Add '-21' to each side of the equation. 21 + -21 + -1x = -8 + -21 Combine like terms: 21 + -21 = 0 0 + -1x = -8 + -21 -1x = -8 + -21 Combine like terms: -8 + -21 = -29 -1x = -29 Divide each side by '-1'. x = 29 Simplifying x = 29
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