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x+1/2-1/4=2.5
x+1/4=2.5
x=10
2.
m/3+2/5=26/15
m/3=26/15 x 5/2
m/3=13/3
m=13
4X +2 -1 =10
4X =9
x=9/4
x=2,25
m/3+2/5=26/15.....multiplicamos por 15 para eliminar denominadores:
5m +6 =26
5m=26-6
5m=20
m=20/5
m=4