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resta: 8x-7x=x , -5x-3x-8=-8x-8 8x-3c-4x-1c=4x-4c
5m-1n-4-7m-4n=-2m-5n-4
multiplicacion: 4x.5n= 4.x.5.n=20xn , 5[x+n]=5x + 5n ,3[x+n][x+n]=3x2[3x al cuadrado]+3xn+3xn+3n2 o 3x2+2[3xn]+3n2. , -4x.1o= -4xo
listo si no entiendes me avisas