3x=30
x=10------------(1)
x+2y= 3x+30
2y=2x+30
Putting the value if x from eqn (1)
2y= 2*10 + 30= 50
=> y= 25
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3x=30
x=10------------(1)
x+2y= 3x+30
2y=2x+30
Putting the value if x from eqn (1)
2y= 2*10 + 30= 50
=> y= 25