a11 = b11
a-7=-2b
a-7=-2.4
a-7=-8
a=-8+7
a=-1
a22=b22
3=b-1
3+1=b
4=b / b=4
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a11 = b11
a-7=-2b
a-7=-2.4
a-7=-8
a=-8+7
a=-1
a22=b22
3=b-1
3+1=b
4=b / b=4