Can someone me solve this equation? 3x-7=20+2x

Plz answer asap! i will reward brainliest and 12 points for these three questions!take notice: these three questions are completely different! 1) what is the percentage of sugar in the syrup made of 10 kg of water and 4 kg of suugar? 2) what was the original price if after 10% discount it became $450? 3) at first a price was decreased by 12%, then it was disounted again by an additional 5%. what is the percent of the total discount? , and remeber i will award brainliest and 12 points!

What is the measure of angle x? 37° 82° x°

How many and of which kind of roots does the equation f(x)=2x^4−9x^3+17x^2−16x+6 have?