7x = 2 = 51 is not a valid equality. 2 cannot be equal to 51.
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7x + 9 = 51 7x = 42 x = 42/7 = 6
7x is still the slope, no matter what x equals.
7x + 2 = 5,6
X=4.2666666666667
assuming the gap before x-2 is a +, then x+x-2=7x, so 2x-2=7x, so 5x=-2, so x=-.4