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(1/5)*x-3 = (1/4)*s // - (1/4)*s
(1/5)*x-((1/4)*s)-3 = 0
(-1/4)*s+(1/5)*x-3 = 0
1/5*x-1/4*s-3 = 0 // + -1/4*s-3
1/5*x = -(-1/4*s-3) // : 1/5
x = (-(-1/4*s-3))/1/5
x = 5*(3-(-1/4*s))
x = 5*(3-(-1/4*s))
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