Question

resolva as equações de 1° grau com incógnita
a)3(m+4) + 8 = 2 + m
b) 3(2x -3) + 2(x + 1) =3x+18
c) 2x +3(x-5)=4x+9
d)2(x+1)-3(2x-5)=6x-3
e)3x-5=x-2
f)3x-5=13
g)3x+5=2
h)x-(2x-1)=23
i)2x-(x-1)=5-(x-3)

Answer 1

A) 3(m+4) + 8 = 2 + m 
     3m + 12 + 8 = 2 + m
     3m - m = +2 - 8 - 12
     2m = - 18
     m = -18/2 = -9


b) 3(2x -3) + 2(x + 1) =3x +18
       6x - 9 +2x + 2 = 3x + 18
       6x + 2x -3x = +18 -2 +9
       5x = 25
       x = 25/5 = 5

c) 2x +3(x-5) = 4x+9
    2x + 3x - 15 = 4x +9
    +2x +3x -4x = +9 +15
     x = 24

d) 2(x+1)-3(2x-5)=6x-3
2x + 2 -6+15= 6x -3
+2x -6x = -3 -15 +6 -2
-4x = -14 (-1)
+4x = +14
x= 14/4 =3.5