The error is not there. The error is step 4. -34 becomes positive so it is not -51 it's 17. So the answer is 40/17
Answer:
3a
Step-by-step explanation:
9/3 = 3

b / b = 1
3 x a x 1 = 3a
Step-by-step explanation:
(3х - 7y = 13)×-2
6х + y = 7
-6х +14y = -26
6х + y = 7
15y=-19
y=-19÷15=-1.26
6x+-1.26=7
6x=7+1.26
6x=8.26
x=1.37