Question

Help me please, Which equation can be used to find the value of x?
Worth 20

Answer 1

168 = 18 * x + 12 * 2x

Explanation:

It's the only one that makes sense. You can mark out the 2nd and last one. We don't add 2x + x; for the 3rd, they need to subtract 18 - 2x, so that's not right either.