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4x=75+25
4x=100
x=100/4
x=25
comprobacion
4x-25=75
4(25)-25=75
100-25=75
75=75
80-x=35.5
-x=35.5-80
-x=-44.5
x=44.5
comprobacion
80-x=35.5
80-(44.5)=35.5
35.5=35.5
56-3x=38
-3x=38-56
-3x=-18
3x=18
x=18/3
x=6
comprobacion
56-3x=38
56-3(6)=38
56-18=38
38=38
ojala te sirva :)
4x=75+25 -x=35.5-80 -3x=38-56
x=100/4 -x=-44.5 -3x=-18
x=25 x= 44.5 x=18/3
x=6