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Simplifying 2(f + -6) = -21 Reorder the terms: 2(-6 + f) = -21 (-6 * 2 + f * 2) = -21 (-12 + 2f) = -21 Solving -12 + 2f = -21 Solving for variable 'f'. Move all terms containing f to the left, all other terms to the right. Add '12' to each side of the equation. -12 + 12 + 2f = -21 + 12 Combine like terms: -12 + 12 = 0 0 + 2f = -21 + 12 2f = -21 + 12 Combine like terms: -21 + 12 = -9 2f = -9 Divide each side by '2'. f = -4.5 Simplifying f = -4.5
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