#### Answer

$-35x$

#### Work Step by Step

$7x$ is the same as $7\times x$.
$-5(7x)$ can be written as
$-5\times(7\times x)$ $\longrightarrow$ associative property
=$(-5\times7)\times x$ $\longrightarrow$multiply
=$-35\times x$
A variable multiplied by a number can also be written as a variable term with a coefficient, so
$-35\times x=-35x$