Question

3x-8=x+4
4x+20=45-x
-4x+13=6x-7
PORFA ES PARA HOY

Answer 1

$3x - 8 = x + 4 \\ 3x - x = 4 + 8 \\ 2x = 12 \\ x = 12 \div 2 \\ x = 6$

$4x + 20 = 45 - x \\ 4x + x = 45 - 20 \\ 5x = 25 \\ x = 25 \div 5 \\ x = 5$

$- 4x + 13 = 6x - 7 \\ - 4x - 6x = - 7 - 13 \\ - 10x = - 20 \\ x = - 20 \div ( - 10) \\ x = 2$