Answer:
A
Step-by-step explanation:
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1. 3x-10=x+70
+10 -x
2x=80
x=40
2. x+27+2x-39=180
3x-12=180
+12
3x = 180
x = 64
3. 2x ÷ 80=5x+44
- 2x -44
36= 3x
12=x
7x8÷4x37x8÷4x3 = 3108/1 = 3108
m=-4
you are subtracting all the numbers by 4 therefore they are all changing by -4
