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Simplifying 7x + 13 + -9x = 21 Reorder the terms: 13 + 7x + -9x = 21 Combine like terms: 7x + -9x = -2x 13 + -2x = 21 Solving 13 + -2x = 21 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-13' to each side of the equation. 13 + -13 + -2x = 21 + -13 Combine like terms: 13 + -13 = 0 0 + -2x = 21 + -13 -2x = 21 + -13 Combine like terms: 21 + -13 = 8 -2x = 8 Divide each side by '-2'. x = -4 Simplifying x = -4
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