Remember that to solve an equation we need to isolate the variable in one side. To do it we can perform any mathematical operations we want as long as we perform the operations to both sides of the equation.
Let's solve our equation step by step
Step 1. Subtract 
from both sides of the equation
Step 2. Subtract 3 from both sides of the equation
Step 3. Divide both sides of the equation by 
We can conclude that the next step is: subtract 3 from both sides of the equation.
Here, 3x-70 = x [ corresponding angles ]
3x-x = 70
2x = 70
x = 35
So, ABC = 3x-70 = 3(35)-70 = 105-70 = 35 degrees
So, your final answer is 35
m<XYZ=120° => m<XYZ is an an obtuse angle, but the picture of m<XYZ is an acute angle
Answer: a = -3
Step-by-step explanation: First we distribute the -2 to a and -3 to get -2a+6=12, then subtract 6 on both sides, -2a=6, finally divide by -2 on each side to get a = -3.
Hope this helps!
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