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x in (-oo:+oo)
(-1/3)*(x+2) = 7*x+3 // - 7*x+3
(-1/3)*(x+2)-(7*x)-3 = 0
(-1/3)*(x+2)-7*x-3 = 0
-1/3*(x+2)-7*x-3 = 0
-1/3*(x+2)-7*x-3 = 0
-22/3*x-3-2/3 = 0
-22/3*x-11/3 = 0
-22/3*x-11/3 = 0
-22/3*x-11/3 = 0 // + 11/3
-22/3*x = 11/3 // : -22/3
x = 11/3/(-22/3)
x = -1/2
x = -1/2
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