Question

U=R 10 x − 1 = 2 x 2 + 7

Answer 1

10x - 1 = 2.2 + 7
10x - 1 = 4 + 7
10x = 4 + 7 - 1
10x = 11 - 1
10x = 10
x = 10/10
x = 1

Um abraço.