Explicación paso a paso:
2x-[x-x+50]=x-800+3x
2x-[50]=4x-800
2x-50=4x-800
2x-4x=50-800
-2x=-750
x=375
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Explicación paso a paso:
2x-[x-x+50]=x-800+3x
2x-[50]=4x-800
2x-50=4x-800
2x-4x=50-800
-2x=-750
x=375