In linear change, the two variables keep increasing or decreasing at the same speed.
3x - 7 + 7 = 12 + 7
3x = 19
3x/3 = 19/3
X = 19/3 = 6 1/3
4 since there are 4 digits to move the decimal
<h3><u>Answer</u> :</h3>
Let's solve !
<u>Hence, Oprion-D is correct</u> !