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Simplifying 9 + 4 = 3x + 4x Combine like terms: 9 + 4 = 13 13 = 3x + 4x Combine like terms: 3x + 4x = 7x 13 = 7x Solving 13 = 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. 13 + -7x = 7x + -7x Combine like terms: 7x + -7x = 0 13 + -7x = 0 Add '-13' to each side of the equation. 13 + -13 + -7x = 0 + -13 Combine like terms: 13 + -13 = 0 0 + -7x = 0 + -13 -7x = 0 + -13 Combine like terms: 0 + -13 = -13 -7x = -13 Divide each side by '-7'. x = 1.857142857 Simplifying x = 1.857142857
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