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x=2
Step-by-step explanation:
y=7-2x -------(1)
6y=9x
y=9x/6 = 3x/2------(2)
Now,
Equation equation 1 and 2
7-2x= 3x /2
2(7-2x)=3x
14-4x=3x
14=4x+3x
14=7x
14/7=x
x=2