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Simplifying 3 + x = 7x + 15 + 3(2 + x) 3 + x = 7x + 15 + (2 * 3 + x * 3) 3 + x = 7x + 15 + (6 + 3x) Reorder the terms: 3 + x = 15 + 6 + 7x + 3x Combine like terms: 15 + 6 = 21 3 + x = 21 + 7x + 3x Combine like terms: 7x + 3x = 10x 3 + x = 21 + 10x Solving 3 + x = 21 + 10x Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-10x' to each side of the equation. 3 + x + -10x = 21 + 10x + -10x Combine like terms: x + -10x = -9x 3 + -9x = 21 + 10x + -10x Combine like terms: 10x + -10x = 0 3 + -9x = 21 + 0 3 + -9x = 21 Add '-3' to each side of the equation. 3 + -3 + -9x = 21 + -3 Combine like terms: 3 + -3 = 0 0 + -9x = 21 + -3 -9x = 21 + -3 Combine like terms: 21 + -3 = 18 -9x = 18 Divide each side by '-9'. x = -2 Simplifying x = -2
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