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x in (-oo:+oo)
(-3/8)*(x-7) = 3*x+5 // - 3*x+5
(-3/8)*(x-7)-(3*x)-5 = 0
(-3/8)*(x-7)-3*x-5 = 0
-3/8*(x-7)-3*x-5 = 0
-3/8*(x-7)-3*x-5 = 0
21/8-27/8*x-5 = 0
-27/8*x-19/8 = 0
-27/8*x-19/8 = 0
-27/8*x-19/8 = 0 // + 19/8
-27/8*x = 19/8 // : -27/8
x = 19/8/(-27/8)
x = -19/27
x = -19/27
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