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0.4*r-1.2 = (1/4)*x+6 // - (1/4)*x+6
0.4*r-((1/4)*x)-6-1.2 = 0
0.4*r+(-1/4)*x-6-1.2 = 0
0.4*r-1/4*x-7.2 = 0 // - 0.4*r-7.2
-1/4*x = -(0.4*r-7.2) // : -1/4
x = (-(0.4*r-7.2))/(-1/4)
x = -4*(7.2-(0.4*r))
x = -4*(7.2-(0.4*r))
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