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Simplifying 7(f + -45) = 21 Reorder the terms: 7(-45 + f) = 21 (-45 * 7 + f * 7) = 21 (-315 + 7f) = 21 Solving -315 + 7f = 21 Solving for variable 'f'. Move all terms containing f to the left, all other terms to the right. Add '315' to each side of the equation. -315 + 315 + 7f = 21 + 315 Combine like terms: -315 + 315 = 0 0 + 7f = 21 + 315 7f = 21 + 315 Combine like terms: 21 + 315 = 336 7f = 336 Divide each side by '7'. f = 48 Simplifying f = 48
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