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=7x-4x=20+4
=3x=24
x=8
2. 1/2(x+5)=1/3(6x-3)
3x+15=12x-6
3x-12x=-6-15
-9x=-21
x=-21/-9=7/3=2 1/3
3.3(2y-2)=4y+2
6y-6=4y+2
6y-4y=2+6
2y=8
y=4