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x in (-oo:+oo)
5-(x/3) = (3*x+3)/7 // - (3*x+3)/7
5-((3*x+3)/7)-(x/3) = 0
(-1*(3*x+3))/7-x/3+5 = 0
(-1*3*(3*x+3))/(3*7)+(7*(-x))/(3*7)+(3*5*7)/(3*7) = 0
7*(-x)-1*3*(3*x+3)+3*5*7 = 0
105-16*x-9 = 0
96-16*x = 0
(96-16*x)/(3*7) = 0
(96-16*x)/(3*7) = 0 // * 3*7
96-16*x = 0
96-16*x = 0 // - 96
-16*x = -96 // : -16
x = -96/(-16)
x = 6
x = 6
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