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b in (-oo:+oo)
2.8 = b/7.5 // - b/7.5
2.8-(b/7.5) = 0
2.8-0.13333333*b = 0
2.8-0.13333333*b = 0 // - 2.8
-0.13333333*b = -2.8 // : -0.13333333
b = -2.8/(-0.13333333)
b = 21.00000053
b = 21.00000053
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