If you mean: x+4x--9 = x+1 then 4x = -8 and x = -2
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The lines are perpendicular.
4x + 20
Impossible to give a correct solution in the absence of any plus or minus signs.
Let the unknown number be X: -4x-10 = 2 -4x = 2+10 -4x = 12 x = -3 Remember that a minus multiplied by a minus is equal to a plus: -4*-3 = 12
This would simplify as 4x-5