x-3x-1.2=4.8-5x

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x-3x-1.2=4.8-5xx-3x-1.2=4.8-5xx-3x-1.2=4.8-5x即x-3x-1.2=4.8-5x5x+x-3x=4.8+1.23x=6x=2x-3x-1.2=4.8-5xx-

x-3x-1.2=4.8-5x
x-3x-1.2=4.8-5x

x-3x-1.2=4.8-5x

x-3x-1.2=4.8-5x
5x+x-3x=4.8+1.2
3x=6
x=2

x-3x-1.2=4.8-5x
x-3x-1.2+5x=4.8
3x=4.8+1.2=6
x=2;
有问题请追问~~

x-3x-1.2=4.8-5x
=X-3X+5X=4.8+1.2
3X=6
X=2