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Simplifying 1 + 2.7 + 4 + 0.3x = 21 Combine like terms: 1 + 2.7 = 3.7 3.7 + 4 + 0.3x = 21 Combine like terms: 3.7 + 4 = 7.7 7.7 + 0.3x = 21 Solving 7.7 + 0.3x = 21 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-7.7' to each side of the equation. 7.7 + -7.7 + 0.3x = 21 + -7.7 Combine like terms: 7.7 + -7.7 = 0.0 0.0 + 0.3x = 21 + -7.7 0.3x = 21 + -7.7 Combine like terms: 21 + -7.7 = 13.3 0.3x = 13.3 Divide each side by '0.3'. x = 44.33333333 Simplifying x = 44.33333333
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