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Simplifying 4 = 7x + 4 + 2x Reorder the terms: 4 = 4 + 7x + 2x Combine like terms: 7x + 2x = 9x 4 = 4 + 9x Add '-4' to each side of the equation. 4 + -4 = 4 + -4 + 9x Combine like terms: 4 + -4 = 0 0 = 4 + -4 + 9x Combine like terms: 4 + -4 = 0 0 = 0 + 9x 0 = 9x Solving 0 = 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. 0 + -9x = 9x + -9x Remove the zero: -9x = 9x + -9x Combine like terms: 9x + -9x = 0 -9x = 0 Divide each side by '-9'. x = 0 Simplifying x = 0
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