1) 405 - (9x + 70) /4=383
1620-9x-70=1532
-9x+1550=1532
-9x=1532-1550
-9x=-18
x=2
2) 1800/(240/y) - 47=253
1800-47(240/y)=253(240/y)
1800y-11280=60720
1800y=60720+11280
1800y=72000
y=40
1) 405 - (9x + 70) /4=383
1620-9x-70=1532
-9x+1550=1532
-9x=1532-1550
-9x=-18
x=2
2) 1800/(240/y) - 47=253
1800-47(240/y)=253(240/y)
1800y-11280=60720
1800y=60720+11280
1800y=72000
y=40