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x+6(x+1) = 755
x+6x+6 = 755
7x = 755 - 6
7x = 749
x = 17
7x = 755
x = 755/7
x = 107.8
comprobacion:
x+6x = 755
107,8+6(107,8) = 755
754,6 = 755
755 = 755