Question

Resolva as equações de 1° Grau: A) 12•x–30=9•x+12 B) 3–x=6•(x+1)–8•x

Answer 1

A) 12•x–30=9•x+12
12x-30=9x+12
12x-9x=12+30
3x=42
x=42/3
x=14

B) 3–x=6•(x+1)–8•x
3-x=6x+x-8x
-x-6x-x+8x=-3
-8x+8x=-3
0= -3