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x in (-oo:+oo)
(2*x)/30 = 7.7 // - 7.7
(2*x)/30-7.7 = 0
1/15*x-7.7 = 0 // + 7.7
1/15*x = 7.7 // : 1/15
x = 7.7/1/15
x = 115.49999423
x = 115.49999423
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