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Simplifying 3(x + 7) + -2x = 3 + 2x Reorder the terms: 3(7 + x) + -2x = 3 + 2x (7 * 3 + x * 3) + -2x = 3 + 2x (21 + 3x) + -2x = 3 + 2x Combine like terms: 3x + -2x = 1x 21 + 1x = 3 + 2x Solving 21 + 1x = 3 + 2x Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-2x' to each side of the equation. 21 + 1x + -2x = 3 + 2x + -2x Combine like terms: 1x + -2x = -1x 21 + -1x = 3 + 2x + -2x Combine like terms: 2x + -2x = 0 21 + -1x = 3 + 0 21 + -1x = 3 Add '-21' to each side of the equation. 21 + -21 + -1x = 3 + -21 Combine like terms: 21 + -21 = 0 0 + -1x = 3 + -21 -1x = 3 + -21 Combine like terms: 3 + -21 = -18 -1x = -18 Divide each side by '-1'. x = 18 Simplifying x = 18
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