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x in (-oo:+oo)
(3/10)*(x+2) = 12 // - 12
(3/10)*(x+2)-12 = 0
3/10*(x+2)-12 = 0
3/10*(x+2)-12 = 0
3/10*x-57/5 = 0
3/10*x-57/5 = 0
3/10*x-57/5 = 0 // + 57/5
3/10*x = 57/5 // : 3/10
x = 57/5/3/10
x = 38
x = 38
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