What mathematical operation always results in positive number

Absolute value

Step-by-step explanation:

The absolute value always results in a plus result.

abs(-4) = 4

abs(4) = 4

Even if it is more complicated like

abs(x^3 - 7)

Let x = - 2

abs( (-2)^3 - 7)

abs( - 8 - 7)

abs(-15)

15

the answer would be 1 1/72

step-by-step explanation:

you can rewrite the equation by separating the parts and then solving individually:

10-9=1

1/8 - 1/9=

find l c d and then combine:

1 1/72

2(2x + 3) = -4 + 2(2x + 5)

4x + 6 = -4 + 4x + 10

4x + 6 = 4x + 6

4x - 6 + 6 = 4x - 6 + 6

4x = 4x

x = x

unlimited solutions.