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4y+3x-3x=7-3x

4y=7-3x

divide both side by 4

we get

y=7/4-3x/4

y=1.75-0.75x

and the best method is trial and error method . i mean substituting the related values is best i.e x=1 (or) y=1 and this equation have unique solutions. so we need to plot a graph to get answer