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entonces:
2x+1+2x+3+2x+5 = 51
6x+ 9 = 51
6x = 51-9
6x = 42
x = 42/6
x = 7
2x+1 = 2(7) +1 = 14+1 = 15
2x+3 =2(7) +3 = 14+3 = 17
2x+5 = 2(7)+5 = 14 +5 = 19
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