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117 + 2x / 20 = 6,7
117 + 2x = 134
2x = 134 - 117
2x = 17
x = 17 / 2
x = 8,5
n1 = 18
x2 = x
n2 = 2
(6,5 . 18) + (x .2 )/20 = 67
(117) + 2x /20 =67
117 + 2x = 134
2x = 134 -117
2x = 17
x = 17/2 = 8,5