a) 6/6 + 4x/6 = 9/6 + 1x/6 6+4x=9+1x 4x-1x=6-9 3x=-3 x= 1
b) 18x/90 +20/90=320/9-45x/90 18x+20=320-45x 18x-45x=320-20 27x=300 x = 300/27 x = 100/9
c) 5/3 * (x+2) = 97 5x/3+10/3 = 97 5x+10= 291 5x=291-10 5x=281 x=281/5
d) 2:(x-3/2)=1/4 4:4x-6=4 4:4x=10 4x=40 x=10