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5x-2x=2-3
3x=-1
x=-1/3
b.- 5(x-3)=2x+3(x-5)
5x-15=2x+3x-15
5x-15=5x-15
5x-5x=-15+15
0=0
c.- 3x-2/5=2x-1/3
3x-2x=-1/3+2/5
x=-5+6/15
x=1/15.