Răspuns:
x/2-(x+7)/10=(x-1)/4-1/5(x+1)+11/20
x/2-(x+7)/10=(x-1)/4-(x+1)/5+11/20 aducem la acelasi numitor
10x-2x-14=5x-5-4x-4-11
10x-2x-5x+4x=-5-4+11+14
7x=16
x=16/7
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(5x-1)/30-(2x+1)/5=(9x+13)/30-(3x-5)/6 aducem la acelasi numitor
5x-1-12x-6=9x+13-15x+25
5x-12x-9x+15x=13+25+1+6
-x=45
x=-45