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x in (-oo:+oo)
(3/7)*(x-7) = 7*x+5*x-3 // - 7*x+5*x-3
(3/7)*(x-7)-(7*x)-(5*x)+3 = 0
(3/7)*(x-7)-7*x-5*x+3 = 0
3/7*(x-7)-7*x-5*x+3 = 0
3/7*(x-7)-7*x-5*x+3 = 0
3-46/7*x-5*x-3 = 0
3-81/7*x-3 = 0
-81/7*x = 0
(-81*x)/7 = 0
(-81*x)/7 = 0 // * 7
-81*x = 0
-81*x = 0 // : -81
x = 0
x = 0
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