Answer:
add 10y to both sides of the equation
Step-by-step explanation:
5x-10y=30
+10y +10y
5x=10y+30
/5 /5 /5
x=2y+6
x=4
5x-4x+2=6
x+2=6
x=6-2
178 is your answer I'm pretty sure
The correct answer is 20x-1