Question

dê a raiz das equações

a) 2(x+3)=30
b)3(2x+4)=4(x+6)
c)2(x +7)-3(5-x)=8
d)10-(x+6)=20
e)3x= -45-2x
f)m-5= - 7
g)3y/4-6=12
h)2(n+3)-5n=6

Answer 1

a)2x+6=30
2x=30-6
x=24/2
x=12

b)6x+12=4x+24
6x-4x=24-12
2x=12
x=12/2
x=6


c)2x+14-15+3x=8
2x+3x+14-15=8
5x-1=8
5x=8+1
5x=9
x=9/5


d)10-x-6=20
10-6-x=20
4-x=20
-x=20-4
-x=16 ×(-1)
x=-16

e)3x=-45-2x
3x+2x=-45
5x=-45
x=-45/5
x=-9


f)m-5=-7
m=-7+5
m=-2