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x in (-oo:+oo)
6*r-(7/10) = x/2 // - x/2
6*r-(x/2)-(7/10) = 0
6*r-(x/2)-7/10 = 0
6*r-1/2*x-7/10 = 0 // - 6*r-7/10
-1/2*x = -(6*r-7/10) // : -1/2
x = (-(6*r-7/10))/(-1/2)
x = -2*(7/10-(6*r))
x = -2*(7/10-(6*r))
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