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Simplifying -5x + 3(x + 7) = 7 Reorder the terms: -5x + 3(7 + x) = 7 -5x + (7 * 3 + x * 3) = 7 -5x + (21 + 3x) = 7 Reorder the terms: 21 + -5x + 3x = 7 Combine like terms: -5x + 3x = -2x 21 + -2x = 7 Solving 21 + -2x = 7 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-21' to each side of the equation. 21 + -21 + -2x = 7 + -21 Combine like terms: 21 + -21 = 0 0 + -2x = 7 + -21 -2x = 7 + -21 Combine like terms: 7 + -21 = -14 -2x = -14 Divide each side by '-2'. x = 7 Simplifying x = 7
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