a) ( x : 273 ) - 946 = 754
x : 273 = 754 + 946
x : 273 = 1700
x = 1700 x 273
x = 464100
b) ( 325 - x ) : 11 = 18
325 - x = 18 x 11
325 - x = 198
x = 325 - 198
x = 127
(X:273)-946=754
=>X:273=754+946
=>X:273=1700
=>X=1700x273
=>X=464100
(325-X):11=18
=>325-X=18x11
=>325-X=198
=>X=325-198
=>X=127