Help??? Solving Equations with Variables on Both Sides?? pre algebra?

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Can anyone explain how to do these problems?? PLEASE any help is taken gratefully!

1.) 15 - x = 2(x + 3)
2.) 15y + 14 = 2(5y+6)
3.) 4(3d - 2) = 8d - 5
4.) (x + 5)4 = (3x)3
 
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