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x in (-oo:+oo)
(2/5)*x+5 = 12 // - 12
(2/5)*x-12+5 = 0
2/5*x-7 = 0 // + 7
2/5*x = 7 // : 2/5
x = 7/2/5
x = 35/2
x = 35/2
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