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x in (-oo:+oo)
(x-3)/10 = 7/2 // - 7/2
(x-3)/10-(7/2) = 0
(x-3)/10-7/2 = 0
(2*(x-3))/(2*10)+(-7*10)/(2*10) = 0
2*(x-3)-7*10 = 0
2*x-76 = 0
(2*x-76)/(2*10) = 0
(2*x-76)/(2*10) = 0 // * 2*10
2*x-76 = 0
2*x-76 = 0 // + 76
2*x = 76 // : 2
x = 76/2
x = 38
x = 38
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