3.95*10^9 move the decimal to the left untill it is in between the last ans 2nd to last number

Add 7 to both sides

At the left hand side 7 will cancel 7
At the right hand side 7 will add up

Divide through by 2

simplify the fraction

Answer: x=3
First you cross multiply
Next you swap sides then divide both sides by 4
Merry Christmas and a happy new year
The correct answer is 4 :-)