# Simplify 7-x-3x ?

Nov 5, 2017

$- 4 x + 7$

#### Explanation:

To simplify this problem, we first have to combine like terms.
$- x$ and $- 3 x$ are like terms, so when we combine them we get $- 4 x$.
There are no more like terms, so unless if we know what x is,
$7 - x - 3 x$ can be simplified to $7 - 4 x$.
In math, when we have answers like this it's best to put numbers with exponents or coefficients before constants, so the final answer should be $- 4 x + 7$.

Nov 5, 2017

Expression $= 7 - 4 x$
[Assuming $X$ and $x$ represent the same variable]
Assuming $X$ and $x$ represent the same variable
Expression $= 7 - x - 3 x$
$= 7 - \left(1 + 3\right) x = 7 - 4 x$