Question

Resolva as equações do 1° grau abaixo: 3x = x + 8 c) x - 3 = 9 4x - 9 = 1 - 2x d) x + 5 = 20 - 4x

Answer 1

$3x=x+8\\2x=8\\x=8/2\\x=4$

$x - 3 = 9\\x=6$

$4x - 9 = 1 - 2x\\6x=10\\x=10/6\\x=5/3$

$x + 5 = 20 - 4x\\5x=15\\x=15/5\\x=3$