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a= 4
2a+2+4-3a= -a+6
-4+6=2
3(4x-4)+7-20=
x=2
12x-12+7-20=12x-25
12*2-25=24-25= -1
3(4*4-4)+7-20=3(16-4)+7-20=36+7-20=23