Question

Resolva as equações
a)2x - 4 + x = - 2 + 4x

c)12 +17t = 13t + 8
e)4 + 3x + 12 = x - 5
f) 2,5 + 1,4 = 1,6 - 1,3
g) -z + 12 + 5z = -2z +36

Answer 1

a) 2x-4+x=-2+4x
2x-4x=-2+4x
2x-4x-4x=-2
-6x=-2 ×(-1)
6x=2
x=6÷2
x=3

c) 12+17t=13t+8
17t-13t=8-12
4t=0,6
t= 0,6÷4
t= 0,15

e) 4+3x+12=x-5
4+3x+12=-5x
3x+5x=-12-4
8x=-16
x=-16÷8
x=-2

f) 2,5+1,4=1,6-1,3
2,5+1,4-1,6+1,3=
3,6

g) -z+12+5z=-2z+36
-z+5z+2z=36-12
6z=24
z=24÷6
z=4