distributive property to multiply

1. How would you do this?? “simplify the expression. First use the distributive property to multiply & remove the parentheses” 4(3x+1) + 5 (x-3)

2. -2x -2x = 23-3 solution = -5 but why?? how?

3. 5n+50=60 n= 2 ?!! why does n = 2?

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