1) 2x + 9 = 2x -5
9 ≠ -5 ; No solution
2) 2x- 1 = x + 3
x = 4; One solution x = 4
3) x + 2 = x + 2
0 = 0; Identity (or all real numbers)
Answer:
the answer is "B" (thank me later) ;))
(11.6+7.3) - (6.2 × 2.1)
(18.9)-(13.02)
= 149.1
