142 + (118 - x) = 217
118 - x = 217 - 142
118 - x = 75
x = 118 - 75
x = 43
142 + ( 118 - x ) = 217
118 - x = 217 - 142
118 - x = 75
x = 118 - 75
x = 43
142+(118-x)=217
=>118-x=217-142
=>118-x=75
=>x=118-75
=>x=43
tíc mình nha
124 + ( 118 - x ) = 217
( 118 - x ) = 217 - 124
118 - x = 93
x = 118 - 93
x = 25
142 + (118 - x) = 217
118 - x = 217 - 142 = 75
x = 118 - 75 = 43
142+(118-x)=217
118-x=217-142
118-x=75
x=118-75
x=43
142+(118-x)=217
=>118-x=217-142
=>118-x=75
=>x=118-75
=>x=43
142+(118-x)=217
=>118-x=217-142
=>118-x=75
=>x=118-75
=>x=43
142+(118-x)=217
=>118-x=217-142
=>118-x=75
=>x=118-75
=>x=43
142+(118-x)=217
=>118-x=217-142
=>118-x=75
=>x=118-75
=>x=43
