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x in (-oo:+oo)
(2*x-8)/10 = 7 // - 7
(2*x-8)/10-7 = 0
(2*x-8)/10+(-7*10)/10 = 0
2*x-7*10-8 = 0
2*x-78 = 0
(2*x-78)/10 = 0
(2*x-78)/10 = 0 // * 10
2*x-78 = 0
2*x-78 = 0 // + 78
2*x = 78 // : 2
x = 78/2
x = 39
x = 39
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