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22x=280-60
22x=220/:22
x=10
b)
2 i jedna druga x =120-20
2 i jedna druga x=100/:2i jedna druga
x=40
22x=280-60
22x=220\22
x=10
b)x+x+20+0,5x=120
2,5x=120-20
2,5x=100\2.5
x=40
x+x=20+0,5x=120 1,5x=100/:1,5=66,6