7*-2*= 8+2
5*=10
*=2
respuesta:2
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7x+8+4=3x
7x+12=3x
7x-3x=-12
4x=-12
tambien puede ser:
7x+8=3x-4
7x-3x=-4-(-8)
4x=-12
7*-2*= 8+2
5*=10
*=2
respuesta:2