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Simplifying 4x + 9x = 7x Combine like terms: 4x + 9x = 13x 13x = 7x Solving 13x = 7x Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-7x' to each side of the equation. 13x + -7x = 7x + -7x Combine like terms: 13x + -7x = 6x 6x = 7x + -7x Combine like terms: 7x + -7x = 0 6x = 0 Divide each side by '6'. x = 0 Simplifying x = 0
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