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Simplifying 21x + -11 + 51 = 180 Reorder the terms: -11 + 51 + 21x = 180 Combine like terms: -11 + 51 = 40 40 + 21x = 180 Solving 40 + 21x = 180 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-40' to each side of the equation. 40 + -40 + 21x = 180 + -40 Combine like terms: 40 + -40 = 0 0 + 21x = 180 + -40 21x = 180 + -40 Combine like terms: 180 + -40 = 140 21x = 140 Divide each side by '21'. x = 6.666666667 Simplifying x = 6.666666667
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