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b)-4.8x+1,2x-7.3x+4,5x+6x=-0.4x
c)-28.2x-39,2x+41,6x+33,4x=7.6x
-1x(4,8-1,2+7,3-4,5-6)= -4,8x+1,2x-7,3x+4,5x+6= -0,4x
-2x(14,1+19,6-20,8-16,7)= -28,2x-39,2x+41,6x+33,4x= 7,6x