1) 0,74x^2+26x=x(0,74x+26).
x=100; 100*(0,74*100+26)=100*(74+26)=100*100=10000
2)x^2 y^3 - x^3 y^2 =x^2 y^2(y-x),
x=4; y=5; (4^2)*(5^2 )*(5-4)=16*25*1=400
3x-7/6=2x/3-x+4/2
3x-7/6=2x/3-x+2
3x-2x/3+x=2+7/6
(9x-2x+3x)/3=(6+7)/3
10x/3=13/6
10x=3*13/6
10x=13/2
10x=6,5
x=0,65