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Simplifying 21 + -4f = 7f Solving 21 + -4f = 7f Solving for variable 'f'. Move all terms containing f to the left, all other terms to the right. Add '-7f' to each side of the equation. 21 + -4f + -7f = 7f + -7f Combine like terms: -4f + -7f = -11f 21 + -11f = 7f + -7f Combine like terms: 7f + -7f = 0 21 + -11f = 0 Add '-21' to each side of the equation. 21 + -21 + -11f = 0 + -21 Combine like terms: 21 + -21 = 0 0 + -11f = 0 + -21 -11f = 0 + -21 Combine like terms: 0 + -21 = -21 -11f = -21 Divide each side by '-11'. f = 1.909090909 Simplifying f = 1.909090909
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