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1/2x+6=1/3x 3x+36=2x 3x=2x-36 x=-36
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.
9+4x=2x-1 2x=-10 x=-5
It is equal to 2x because if you were to replace the "x" with a number say, 2 for example so 2 + 2 would be 4 and 2 times 2 would also be 4 which is what "2x" stands for (2 times x). So then if you had x + x you would get 2x.
Let x = one number. x + 10 is the other one. 2x + 10 = 40 2x = 30 x = 15 x + 10 = 25 15 + 25 = 40