Question

Exercícios Equação do 1º grau A) 45x -3x + 12 = 15x -3x -12
B) 12x + 24x = 13x + 31 -11
C) 13x + 15x + 10 x = 13x -15x -10x + 50

Answer 1

$a)45x - 3x + 12 = 15x - 3x - 12 \\ 45x - 3x - 15x + 3x = - 12 - 12 \\30x = - 24 \\ x = \frac{ - 24}{30} \\ b)12x + 24x = 13x + 31 - 11 \\23x = 20 \\ x = \frac{20}{23} \\ c)13x + 15x + 10x = 13x - 15x - 10x + 50 \\ 50x = 50 \\ x = 50 \div 50 \\ x = 1$