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