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3x - x = - 7 + 15
2x = 8
x=4
2do. 2x - 4.2 = x - 3
2x - = x - 3
2x - x - 3 = 8
x - 3 = 8
x = 8 + 3
x= 11
3ero. (No me sale brother)
4to: 22x - 2x= 7 + 3
20x = 10
x = 20/10
x = 2
5to: 10x - 5x = 6 - 5
5x = 1
x = 5/1
x = 5
Espero haberte ayudado :)