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a in (-oo:+oo)
(a-0.25)/0.0025 = (a-11.5)/(-0.01) // - (a-11.5)/(-0.01)
(a-0.25)/0.0025-((a-11.5)/(-0.01)) = 0
(a-0.25)/0.0025+100*(a-11.5) = 0
(a-0.25)/0.0025+(0.0025*100*(a-11.5))/0.0025 = 0
0.0025*100*(a-11.5)+a-0.25 = 0
1.25*a-3.125 = 0
(1.25*a-3.125)/0.0025 = 0
(1.25*a-3.125)/0.0025 = 0 // * 0.0025
1.25*a-3.125 = 0
1.25*a-3.125 = 0 // + 3.125
1.25*a = 3.125 // : 1.25
a = 3.125/1.25
a = 2.5
a = 2.5
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