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2014-11-10T19:24:34+02:00
A) x - nr
x/2 - 18 =1
x/2 =1+18
x/2=19
x=19*2
x=38

b) x - nr
x/4+10=20
x/4=20-10
x/4=10
x=10*4
x=40
2014-11-10T19:26:18+02:00
A) x - nrx/2 - 18 =1x/2 =1+18x/2=19x=19*2x=38 
b) x - nrx/4+10=20x/4=20-10x/4=10x=10*4x=40