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3=-2x+x
3=-x
x=3
b)5y=13
y=13/5
y=2 i 3/5
c)1/7x=-2
x=-2*7/1
x=-14
d)-7b=7/8
b=7/8 / (podzielic) -7
b=7/8 * 1/7
b= -1/8
-x+2x=-3
x=-3
b)5y=13/:5
y=2,6
c)1/7x=-2/*7
x=-14
d)-7b=7/8/:-7
b=7/8*(-1/7)=-7/56