how do u solve this

3(5x-14)=18

Divide both sides by 3

$5x-14=6$

Add 14 to both sides.

$5x=20$

Divide both sides by 5

$x=4$

To verify, plug into original equation.

$3(5(4)-14)=18$

Simplify.

$3(20-14)=18$

$3(6)=18$

$18=18$

This is true, so x=4.