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x in (-oo:+oo)
(2/15)*x-(1/5) = 11 // - 11
(2/15)*x-(1/5)-11 = 0
(2/15)*x-1/5-11 = 0
2/15*x-56/5 = 0 // + 56/5
2/15*x = 56/5 // : 2/15
x = 56/5/2/15
x = 84
x = 84
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