ANSWER:
1. x = 9
2. x = 15
3. x = 100
EXPLANATION:
1. x + 3 = 12
First step:
Subtract 3 from both sides of the equation:
x + 3 - 3 = 12 - 3
x = 9
2. -5 + x = 10
Add 5 to both sides of the equation:
-5 + x + 5 = 10 + 5
-5 + 5 + x = 15
x = 15
3. 3x = 300
Divide both sides by 3:
[tex]\begin{gathered} \frac{3x}{3}=\frac{300}{3} \\ \\ x\text{ = 100} \end{gathered}[/tex]x = 100
