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120=2x-15+7x
120+15=2x+7x
135=9x
135/9=x
15=x
respuesta:
x=15
120 = 2x - (15 - 7x)
120 = 2x -15 +7x En el parentesis aplicamos ley de signos - por + = - y
- por - = +
120 +15 = 9x
135 /9 = x
15 = x
x = 15
Solucion:
x = 15