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(4*x)/5-r/5-(-1/2) = -((37*x)/5)-9/2 // + -((37*x)/5)-9/2
(4*x)/5-r/5+(37*x)/5-(-1/2)-(-9/2) = 0
(4*x)/5-r/5+(37*x)/5+1/2+9/2 = 0
41/5*x-1/5*r+5 = 0 // - 5-1/5*r
41/5*x = -(5-1/5*r) // : 41/5
x = (-(5-1/5*r))/41/5
x = -5/41*(5-1/5*r)
x = -5/41*(5-1/5*r)
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