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(2x-7)-(5x-1)
2x-7-5x+1
(2x-5x)+(-7+1)
-3x-6

So you're close, but -7 + 1 isn't -8, it's actually -6

altight ill have to fix a couple of problems then

I think you may have forgotten about distributing the negative completely through

-(5x-1) turns into -5x+1
and NOT -5x - 1

ok going to do it again

so this one:
(-9x^2+3x-7)+(-4x^2-x)
-9x^2+3x-7-4x^2-x
like this ?

yes keep going though

got it incorrect:
-13x^2-2x-7

+3x - x
+3x - 1x
+2x