Daca a-2b=5 inseamna ca a=5+2b
a) x+2(5+2b)-4b=15
x+10+4b-4b=15
x+10=15
x=15-10
x=5
b)25(5+2b)+x+50b=200
125+50b+x-50b=200
125+x=200
x=200-125
x=75
c)4(5+2b)-8b-x=10
20+8b-8b-x=10
20-x=10
-x=10-20
-x=-10| ori -1
x=10
d)x+15+3(5+2b)-6b=30
x+15+15+6b-6b=30
x+30=30
x=30-30
x=0
