Answer:
x=15
Step-by-step explanation:
21-6=15
-4x+y=-5x-y=15
x+y=-y=15
x=15
5x - 2 = 13
5x = 13 + 2
5x = 15 (divide both sides by 5 to get x)
5x/5 = 15/5
x = 3
Answer:
18
Step-by-step explanation:
Answer:

Step-by-step explanation:
move variable to the right-hand side and change its sign

divide both sides of the equation

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