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Simplifying 13 = 2x + 7x + 4 Reorder the terms: 13 = 4 + 2x + 7x Combine like terms: 2x + 7x = 9x 13 = 4 + 9x Solving 13 = 4 + 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. 13 + -9x = 4 + 9x + -9x Combine like terms: 9x + -9x = 0 13 + -9x = 4 + 0 13 + -9x = 4 Add '-13' to each side of the equation. 13 + -13 + -9x = 4 + -13 Combine like terms: 13 + -13 = 0 0 + -9x = 4 + -13 -9x = 4 + -13 Combine like terms: 4 + -13 = -9 -9x = -9 Divide each side by '-9'. x = 1 Simplifying x = 1
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