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x+3= 3x+15
3-15=3x-x
-12= 2x
x=-6
b) -8= x-1/4
-32=x-1
x=-1-32
x=-33
c) 2x + 3/ 3 = x-5
2x+3=3x-15
2x-3x=-15-3
-x=-18 Simplificando
X=18