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3x-15=x+3
3x-x=15+3
2x=18
x=18/2
x=9
b)x-5=3(x-9)
x-5=3x-27
-5+27=3x-x
22=2x
22/2=x
11=x
c))x+4)2=(1+x) fijate si la copiaste bien
2x+8=1+x
2x-x=1-8
x=-9
d)3(x+3)+5=5x-2
3x+9+5=5x-2
9+2+5=5x-3x
16=2x
16/2=x
8=x