20×e-(1950+550):100=6175
20×e-2.500:100=6175
20×e-25=6175
20×e=6175+25
20×e=6.200
e=6.200:20
e=310
35×f+(800-752:4):2=551
35×f+(800-188):2=551
35×f+612:2=551
35×f+306=551
35×f=551-306
35×f=245
f=245:35
f=7
g:25+(100-1632:51)×2=286
g:25+(100-32)×2=286
g:25+68×2=286
g:25+136=286
g:25=286-136
g:25=150
g=150×25
g=3.750