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2ª x+12
3ª x+x+12 - 6 = 2x+6
x + x + 12 + 2x + 6 = 110
x + x + 2x = 110 -12 - 6
4x = 98
x = 23
Solución
1ª x -----> 23
2ª x+12 = 23 + 12 = 35
3ª 2x+6 = 2(23)+6 = 52