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Simplifying 3(x + 7) = 2[x + -1(9 + -1x)] Reorder the terms: 3(7 + x) = 2[x + -1(9 + -1x)] (7 * 3 + x * 3) = 2[x + -1(9 + -1x)] (21 + 3x) = 2[x + -1(9 + -1x)] 21 + 3x = 2[x + (9 * -1 + -1x * -1)] 21 + 3x = 2[x + (-9 + 1x)] Reorder the terms: 21 + 3x = 2[-9 + x + 1x] Combine like terms: x + 1x = 2x 21 + 3x = 2[-9 + 2x] 21 + 3x = [-9 * 2 + 2x * 2] 21 + 3x = [-18 + 4x] Solving 21 + 3x = -18 + 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 = -18 + 4x + -4x Combine like terms: 3x + -4x = -1x 21 + -1x = -18 + 4x + -4x Combine like terms: 4x + -4x = 0 21 + -1x = -18 + 0 21 + -1x = -18 Add '-21' to each side of the equation. 21 + -21 + -1x = -18 + -21 Combine like terms: 21 + -21 = 0 0 + -1x = -18 + -21 -1x = -18 + -21 Combine like terms: -18 + -21 = -39 -1x = -39 Divide each side by '-1'. x = 39 Simplifying x = 39
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