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13 = (1/5)*(20*x-5) // - (1/5)*(20*x-5)
13-((1/5)*(20*x-5)) = 0
(-1/5)*(20*x-5)+13 = 0
13-1/5*(20*x-5) = 0
13-1/5*(20*x-5) = 0
14-4*x = 0
14-4*x = 0
14-4*x = 0 // - 14
-4*x = -14 // : -4
x = -14/(-4)
x = 7/2
x = 7/2
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