Answer
$-6x+(-13)x$,
simplifies to $-19x$
Work Step by Step
the product of $-6$ and a number ... $\rightarrow$... $-6x$
...which is increased by ... $\rightarrow -6x+...$
.... the product of $-13$ and a number$\quad\rightarrow -6x+(-13)x.$
This simplifies, first using the distributive property,
$...=[ -6+(-13)]x$
... then, adding same signed numbers, we keep the sign and add their absolute values:
$=-(6+13)x$
$=-19x$
