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x in (-oo:+oo)
(7.5*x)/52.5 = y // - y
(7.5*x)/52.5-y = 0
0.14285714*x-y = 0 // + y
0.14285714*x = y // : 0.14285714
x = y/0.14285714
x = 7.00000014*y
x = 7.00000014*y
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