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b)4,5
c)-4/3
0=4-1/3x
-4=-1/3x
12=x
b) 3y=9-2x
y=3-2/3x
0=3-2/3x
3=2/3x
x=9/2
c)-2y=-4-3x
y=2+3/2x
0=2+3/2x
-2=3/2x
x=-4/3