"10x - x" is basically 10 x's minus one x. The answer is 10 minus 1, but in terms of x. Since 10 minus 1 is 9, the answer is 9x.
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The answer to 10x - x is 9x. This is because when you subtract x from 10x, you are left with 9x. It is important to remember that when subtracting like terms, you only subtract the coefficients (numbers in front of the variable) and keep the variable the same.
10x + (8-x) = -19 10x + 8 = x - 19 10x = x - 27 9x = 27 x = 3
x/10x = 1/10 or 0.1
0
x2-10x = 0 x(x-10) = 0 x = 0 or x = 10
x2 + 9 = 10x x2 - 10x + 9 = 0. (x - 9)(x - 1) = 0. Therefore, x = 1 or 9.