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b in (-oo:+oo)
3-((1/3)*b) = (1/3)*b-7 // - (1/3)*b-7
3-((1/3)*b)-((1/3)*b)+7 = 0
(-1/3)*b+(-1/3)*b+3+7 = 0
10-2/3*b = 0 // - 10
-2/3*b = -10 // : -2/3
b = -10/(-2/3)
b = 15
b = 15
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