2(x-2)-5(1-3x)=2
2x-4-5+15x=2
2x+15x=2+4+5
17x=11
X=11:17
X=11/17(обыкновенная дробь)
-2,5(z+v-z)= -2,5z-2,5v+2,5z
7^(2/3)*49^(2/3)=(7*49)^(2/3)=(7^3)^(2/3)=7^2=49
5^(14/3) :5^(14/3)=1
2^(1/4)*2^(3/4)+(2^5)^(1/5)=2+2=4
1+8(3x+7)=9
1+24x+56=9
24x=9-57
24x=-48
x=-2