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tF = 9/5 tC + 32.........[1]
Dari soal
tF = tC + 12..............[2]
Substitusi [1] ke [2]
tF = tC + 12
9/5 tC + 32 = tC + 12
4/5 tC = - 20
tC = - 20 × 5/4 = - 25 ºC
tF = 9/5 (-25) + 32 = - 45 + 32 = - 13 ºF
Jadi - 25 ºC = - 13 ºF ←
Ok ?