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138 = 2x - 15 + 7x
138 = 9x - 15
- 9x = - 15 - 138
- 9x = - 153
x = -153/-9
x = 17
Solución :
x = 17
138 = 2x - 15 + 7x
138 +15 = 9x
153 = 9x
159/9 = x
17= x
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