-0.72x + 0.42x = 8.4
solve for x

You first have have to add -0.72 and 0.42 because they both have like terms. Then you will get -0.3x. Then you will divide both sides by -0.3 because you have to get x alone. When you do that you’ll get -28. That’s your answer -28.

1/6 of a chance i would believe

Really any number between them works. for example 144.951