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(3/5)*x-2 = (1/4)*r+6 // - (1/4)*r+6
(3/5)*x-((1/4)*r)-6-2 = 0
(-1/4)*r+(3/5)*x-6-2 = 0
3/5*x-1/4*r-8 = 0 // + -1/4*r-8
3/5*x = -(-1/4*r-8) // : 3/5
x = (-(-1/4*r-8))/3/5
x = 5/3*(8-(-1/4*r))
x = 5/3*(8-(-1/4*r))
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