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6x+3=5x+7
6x-5x=7-3
x=4
prueba
6x+3=5x+7
6(4)+3=5(4)+7
24+3=20+7
27=27
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7x+1=6x+6
7x-6x=6-1
x=5
prueba
7x+1=6x+6
7(5)+1=6(5)+6
35+1=30+6
36=36
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8x+2=4x+26
8x-4x=26-2
4x=24
x=24/4
x=6
prueba
8x+2=4x+26
8(6)+2=4(6)+26
48+2=24+26
50=50
saludos