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Simplifying 7x = 9(4 + x) 7x = (4 * 9 + x * 9) 7x = (36 + 9x) Solving 7x = 36 + 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. 7x + -9x = 36 + 9x + -9x Combine like terms: 7x + -9x = -2x -2x = 36 + 9x + -9x Combine like terms: 9x + -9x = 0 -2x = 36 + 0 -2x = 36 Divide each side by '-2'. x = -18 Simplifying x = -18
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