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15*4=3x
60=3x
20=x
b) 3-2x/12 + 3/2
gdzie jest znak =?
c) 1-x/4=1+x/3
4(1+x)=3(1-x)
4+4x=3-3x
7x=-1
x=-1/7
x=20
b)3-2x/12 + 3/2=
3-2x/12 + 18/12= 3-2x+ 18= -2x+21
c)1-x/4=1+x/3 | * 12
12- 3x= 12+ 4x
x=24
x=4
b)3-2x/12+3/2//*12
3-2x+18
coś tu nie gra
c)1-x/4=1=x/3//*12
3(1-x)=4(1+x)
3-3x=4+4x
-3x-4x=4-3
-7x=1//:(-7)
x=-1/7