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X:2-21=37
X:2=37+21
X=16.2
X=32
2)
3x:5=12
3x=12.5
x=60:3
x=20
3)
X+2X=45
3X=45
X=45:3
X=15
La edad de Juan es de 30 años y la de Pedro es de 15.
4)
X:4+(-3)=6
X:4-3=6
X:4=6+3
X=9.4
X=36
5)
3.(X:2)+13=19
3.(X:2)=19-13
X:2=6:3
X=2.2
X=4
Espero que te haya servido