Question

Resolva as equações
a) 7у+5-у+8=
b)5.(3-2a)=55
c)27=3.( ₓ+3)
d)16ₓ+2.(7ₓ+8)-9=67
e)6.(4Z+2)+7.(-5Z+3)=66
f)12+(3x+6).(-7)-5=70

Answer 1

A) 7y+5-y+8=0
7y-y+8+5=0
6y+13
6y=-13
y=-13/6 (aproximadamente -2,166)

B) 5(3-2a)=55
15-10a=55
-10a=55-15
-10a=40
a=40/-10
a=-4

C) 27=3(x+3)
27=3x+9
27-9=3x
18=3x
18/3=x
x=6

D)16x+2(7x+8)-9=67
16x+14x+16-9=67
30x=67-16+9
30x=60
x=60/30
x=2

E) 6(4z+2)+7(-5z+3)=66
24z+12-35z+21=66
-11z=66-21-12
-11z=33
z=33/-11
z=-3

F) 12+((3x+6)(-7))-5=70
12+(-21x-42)-5=70
12-21x-42-5=70
-21x=70+42+5-12
-21x=105
x=105/-21
x=-5