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-9-2x+x = -13 -2x+x = -13+9 -x = -4 x = 4
4-2x-9 = -19 -2x = -19-4+9 -2x = -14 x = 7
4+2x=9 -4 -4 2x=9 2x/2 9/2 x=4 1/2
x - 3x + 4 = 3 - 9 simplify -2x + 4 = -6 -4 -4 -2x = -10 /-2 /-2 x = 5
2x + 1 = 9 2x = 9 - 1 2x = 8 2x/2 = 8/2 x=4