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4) 2,3b-7,4b-3,4b+6,8a
5) 2,3b-3,6b+1,5+1,4b
6) -4,3b-3,6b+1,5+1,4b
7) 5(x-1)+2(x+3)-7x
4) 2,3b-7,4b-3,4b+6,8a
5) 2,3b-3,6b+1,5+1,4b
6) -4,3b-3,6b+1,5+1,4b
7) 5(x-1)+2(x+3)-7x
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4) 2,3b-7,4b-3,4b+6,8a=(2.3-7.4-3.4)b+6.8a=-8.5b+6.8a5) 2,3b-3,6b+1,5+1,4b=(2.3-3.6+1.4)b+1.5=0.1b+1.5a
6) -4,3b-3,6b+1,5+1,4b=-6.5b+1.5
7) 5(x-1)+2(x+3)-7x=5x-5+2x+3-7x=-2