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Simplifying -15 = 3(2 + f) -15 = (2 * 3 + f * 3) -15 = (6 + 3f) Solving -15 = 6 + 3f Solving for variable 'f'. Move all terms containing f to the left, all other terms to the right. Add '-3f' to each side of the equation. -15 + -3f = 6 + 3f + -3f Combine like terms: 3f + -3f = 0 -15 + -3f = 6 + 0 -15 + -3f = 6 Add '15' to each side of the equation. -15 + 15 + -3f = 6 + 15 Combine like terms: -15 + 15 = 0 0 + -3f = 6 + 15 -3f = 6 + 15 Combine like terms: 6 + 15 = 21 -3f = 21 Divide each side by '-3'. f = -7 Simplifying f = -7
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