1) a+b-3+4a-2b-6+3a-5b+4=
2) 4x2+5x-7+6x-8+x2=11x+4-2x2=
2) 4x2+5x-7+6x-8+x2=11x+4-2x2=
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1) 8a-6b-5
2)tengo tres respuestas x=7/2 ,x=3 y 1/2 , x=3,5