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140*p+60*q-((100/6)*x) = 0
140*p+60*q+(-50/3)*x = 0
140*p+60*q-50/3*x = 0 // - 140*p+60*q
-50/3*x = -(140*p+60*q) // : -50/3
x = (-(140*p+60*q))/(-50/3)
x = 3/50*(140*p+60*q)
x = 3/50*(140*p+60*q)
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