Depending on what your question was, there are different answers:
4x + 4 = 7x - 3
7x - 4x = 4+3
3 x = 7
x =7/3
or
4x + 47x -3 = 0
51x = 3
x = 3/51
x=1/17
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If you mean: x+4x--9 = x+1 then 4x = -8 and x = -2
The lines are perpendicular.
4x + 20
Using the discriminant for a quadratic equation the value of k works out as plus or minus 12.
Without an equality sign and not knowing the plus or minus values of some of the given terms the given expression can't be considered to be an equation.