Question

resolva as equaçoes:
A) ( x - 5 ) / 10 + ( 1 - 2x ) / 5 = ( 3 - x ) / 4

B) 4x ( x + 6) - x² = 5x²

Answer 1

$\frac{x-5}{10} + \frac{1-2x}{5} = \frac{3-x}{4} (mmc) \\ \\ \frac{x-5+2-4x}{10} = \frac{3-x}{4} \\ \\ \frac{-3x-3}{10} = \frac{3-x}{4} \\ \\ 4(-3x-3)=10(3-x) \\ \\ -12x-12=30-10x \\ \\ -12x+10x=30+12 \\ \\ -2x=42 \\ \\ x=-21$