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لنفرض أن x هي عدد السنوات التي قام فيها توم بتدريس الموضوعات
قام ديفين بالتدريس لمدة (1/2)x - 5 سنوات
70 = x + ((1/2)x - 5)
70 = (3/2)x - 5
75 = (3/2)x
x = 50
قام توم بتدريس الموضوعات لمدة 50 عاما
#### 50