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x in (-oo:+oo)
(2/3)*(x+7)-((3/4)*(x+3)) = 7/12 // - 7/12
(2/3)*(x+7)-((3/4)*(x+3))-(7/12) = 0
(2/3)*(x+7)+(-3/4)*(x+3)-7/12 = 0
2/3*(x+7)-3/4*(x+3)-7/12 = 0
(2/3*12*(x+7))/12+(-3/4*12*(x+3))/12-7/12 = 0
2/3*12*(x+7)-3/4*12*(x+3)-7 = 0
29-x-7 = 0
22-x = 0
(22-x)/12 = 0
(22-x)/12 = 0 // * 12
22-x = 0
22-x = 0 // - 22
-x = -22 // * -1
x = 22
x = 22
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