you need to reorder the problem by manipulating the numbers
-2x-7=-x+13
group your variables and constants
thus
-x-2x=7+13
simplify
-3x=20
simplify again
x=-20/3
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yes.
2x+3y=13 3x-y=3 x=2
5x - 4x = 13 - 3 ie x = 10
3x+5 = 2x+13 3x-2x = 13-5 x = 8
2x + 1 = 13; 2x = 12; x = 6