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2+x = 4
15 5
5(2+x)=4(15)
10+5x=60
5x=60-10
5x=50
x=50/5
x=10
el numero es el 10
2+10 = 4
15 5
12 = 4
15 5
3(4) = 4
3(5) 5
4 = 4
5 5