It depends on the value of x.
The x is a variable. To evaluate an expression, you need to have a value (number) to replace the x.
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-2x-6= -2x-6Another answer:-2x-6 = 2x+6-2x-2x = 6+6-4x = 12x = -3
2x - 3 = 2x - 52x = 2x - 22x - 2x = -20 =/= -2Zero is not equal to -2 so the answer is no solution.
10001/999900
d/dx sec(2x) = 2sec(2x)tan(2x)
8x4