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