Question

aflati a din : 121-{90:5-4*[20-2(3*a+2)]}=119

Answer 1

a=2
121-{90:5-4*[20-6*a-4]}=119
121-[90:5-4*(16-6*a)]=119
121-[90:5-64+24*a]=119
121-(18-64+24*a)=119
121-(-46+24*a)=119
121+46-24*a=119
167-24*a=119
-24*a=-48
a=2.

Answer 2

121-{90:5 - 4[20-2(3a+2]}=119
121-119-[18-4(20-6a-4)]=0
2-(18-80+24a+16)=0
2-18+80-24a-16=0
48-24a=0
24a=48
a=2
verificare
121-{18-4[20-2(3*2+2)]}=119
121-[18-4(20-2(6+2)]=119
121-[18-4(20-12-4)]=119
121-(18-4*4)=119
121-(18-16)=119
121-2=119