Preciso disso pra AGORA!Por favor me ajudem! 1-Determine o valor das incógnitas das equações a seguir:
a)3x-(x+1)=-x+1
b)2x+4.(38-x)=136
c)2(2x+5)-(4x-9)=3(3-4x)
d)9x-20=8(x-1)
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