20+(x-12)=60
20+x-12=60
X=60-20+12
X=40+12
X=52
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Verified answer
A = {20 elementos}A ∩ B = {12 elementos}
B = {x - 12 elementos}
20 + (x - 12) = 60
20 - 12 + x = 60
8 + x = 60
x = 60 - 8
x = 52
Resposta: 52 elementos
20+(x-12)=60
20+x-12=60
X=60-20+12
X=40+12
X=52