Question

{[(65xa=194)x5-3]x19+12}:25=2

Answer 1

[(65×a-194)x5-3)]×19+12=2×25
[(65×a-194)×5-3]×19=50-12
[(65×a-194)×5-3]=38÷19
(65×a-194)×5=2+3
65×a-194=5÷5
65×a=1+194
a=195÷65
a=3

Answer 2

{[(65xa-194)x5-3]x19+12}=2x25
{[(65xa-194)x5-3]x19+12}=50
[(65xa-194)x5-3]x19=50-12
[(65xa-194)x5-3]x19=38
[(65xa-194)x5-3]=38:19
[(65xa-194)x5-3]=2
(65xa-194)x5=2+3
(65xa-194)x5=5
(65xa-194)=5:5
(65xa-194)=1
65xa=1+194
65xa=195
a=195:65
a=3