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1.- 3x+2=2x+22
3x-2x=22-2
x=20
2.- 5x-(6+8)=3x-6
5x-14=3x-6
5x-3x=-6+14
2x=8
x=8/2=4
3.- 3x+3=5x-1
3x-5x=-1-3
-2x=-4
x=-4/-2=2
4.- 4x=x+15
4x-x=15
3x=15
x=15/3=5
espero y te sirva :)