Question

x+ x     3x
    __ + __ =18
    2       4

Answer 1

mmc de 2 e 4 = 4

4x/4 + 2x/4+ 3x/4 = 72/4

eliminar as bases e resolver a equação

4x + 2x + 3x = 72

9x = 72

x = 72/9

x = 8