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48=6x+6x
48=12x // :12
x=4
b) 48=6*2y+0,5*6*y+2 i jedna druga*3y
48=12y+szesc dwunastych y+3y
48=2 i dwie trzecie
c)2,1-0,3x=0,4x
-0,3-0,4x=2,1
-0,7x=2,1//:(-7)
x=3
d)-1,5x-3=0,2x+6
-1,5x-0,2x=6+3
-1,7x=9 //:(-1,7)
x=5 i piec siedemnastych