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2x- y =3 /2
7 ×1.5+1/2 y -2y = 9
x= 1.5 +1/2 y
10.5 -1.5y=9
x= 1.5 +1/2 y
-1.5y=9-10.5
x= 1.5 +1/2 y
-1.5y=-1.5
x= 1.5 +1/2 y
y=1
x=1.5+1/2 ×1
y=1
x=1.5+1/2
y=1
x=2