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5(x-3/10)=2x+9/2;x face parte din Q+
4(x/2-3/20)=17/5-3x;x face parte din N


Răspuns :

5(x-3/10)=2x+9/2=>5(10x-3)/10=(4x+9)/2=>(10x-3)/2=(4x+9)/2|:2=>10x-3=4x+9=>10x-4x=9+3=>6x=12=>x=12/6=2 si apartine lui Q+
4(x/2-3/20)=17/5-3x=>2x-3/5=17/5-3x=>3x+2x=(17+3)/5=>5x=20/5=>x=4/5