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Simplifying x + 4 = 3(x + 7) Reorder the terms: 4 + x = 3(x + 7) Reorder the terms: 4 + x = 3(7 + x) 4 + x = (7 * 3 + x * 3) 4 + x = (21 + 3x) Solving 4 + x = 21 + 3x Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-3x' to each side of the equation. 4 + x + -3x = 21 + 3x + -3x Combine like terms: x + -3x = -2x 4 + -2x = 21 + 3x + -3x Combine like terms: 3x + -3x = 0 4 + -2x = 21 + 0 4 + -2x = 21 Add '-4' to each side of the equation. 4 + -4 + -2x = 21 + -4 Combine like terms: 4 + -4 = 0 0 + -2x = 21 + -4 -2x = 21 + -4 Combine like terms: 21 + -4 = 17 -2x = 17 Divide each side by '-2'. x = -8.5 Simplifying x = -8.5
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