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4x-x+3x=-6+6-12
6x=-12 /:6
x=-2
b) 6-4x+1=3x-3
-4x-3x=-3-6-1
-7x=-10 /:-7
x=1 3/7
c) 24y-16-7y=60-15y+13y
25y-7y+15y-13y=60+16
20y=66/:20
y=3,3
d) 5x-2-3x+0,6=6,4x-9,6
5x-3x-6,4x=-9,6+2-0,6
-4,4x=-8,2/ :-4,4
x=1,86