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y = 5 - 7
=> y = -2 -------(i)
y = -2x + 7
=> -2 = -2x + 7 [From (i)]
=> -2 -7 = -2x
=> -9 = -2x
=> -9/-2 = x
=> 9/2 = x
So, x = 9/2 and y = -2