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L=N
180= K + N
180= ( x + 5 ) + ( 3x - 25 )
180= x + 5 + 3x - 25
180= 4x -20
200=4x
4x= 200
x = 50
karena L = N
maka
L = N = ( 3x - 25 )
L = N = ( 3 (50) - 25)
L = N = ( 150 -25)
L = N = 125
3a+a = 4
silahkan diliat, hasilnya a = 50.
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