Algebra Examples

$x - - 2 x$

Step 1

Replace all occurrences of $-$ $-$ with a single $+$ . Two consecutive minus signs have the same mathematical meaning as a single plus sign because $- 1 \cdot - 1 = 1$

$x + 2 x$

Step 2

Add $x$ and $2 x$ .

$3 x$