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x in (-oo:+oo)
25/6 = (21/2)*(x+2) // - (21/2)*(x+2)
25/6-((21/2)*(x+2)) = 0
(-21/2)*(x+2)+25/6 = 0
25/6-21/2*(x+2) = 0
(-21/2*6*(x+2))/6+25/6 = 0
25-21/2*6*(x+2) = 0
-63*x-101 = 0
(-63*x-101)/6 = 0
(-63*x-101)/6 = 0 // * 6
-63*x-101 = 0
-63*x-101 = 0 // + 101
-63*x = 101 // : -63
x = 101/(-63)
x = -101/63
x = -101/63
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