-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.

38+105= 143, 39+104=143, and you will find then adding the numbers on opposite sides, moving inwards yields the answer 138 every time. because of this, you’re going to multiply 138 times the number of pairs, which is 34. therefore, 34*138= 4692(i’m sorry if it’s the wrong numbers, but it’s the right concept)

(-8,5) bu tun not sure ok