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3(x+2)+5+(2x-4)=3x+6+5+2x-4=7+5x
(3a-4b+1)-2(a-b+5)=3a-4b+1-2a+2b-10=-9+a-2b
4(5x-8y-3)+[3(x-1)+y]=20x-32y-12+[3x-3+y]=20x-32y-12+3x-3+y=-15+23x-31y
2(a-3b+2)-3(2a-4b)+5(b+4)=2a-6b+4-6a+12b+5b+20=24-4a+11b