Question

Gostaria que me ajudassem com esses
Cálculos origada

Answer 1

54. a) 7y+5-y+8 = 31
7y-y= 31-5-8
6y= 44
y= 44/6 = y = 22/3

b) 5.(3-2a) = 55
15-10a = 55
-10a = 55-15
-10a = 40
a =  40/-10= 4/-1= 4

c)27 = 3.(x+3)
27 = 3x + 9
3x = 9 - 27
3x = - 18
x = -18/3 = -6/1 = -6

d) 16x + 2(7x+8)-9 = 67
16x+14x+16-9 = 67
30x = 67-16+9
30x= 51+9
30x= 60
x= 60/30 = 20/10 = 4/2= 2/1= 2

e) 6.(4z + 2) + 7(-5z+3) = 66
24z+12-35+21= 66
24z= 66 -12+35-21
24z=54+35-21
24z= 89-21
24z= 68
z = 68/24 = 34/12 = 17/6

f)12+(3x+6).(-7)-5 = 70
12-21x-42-5 = 70
-21x= 70-12+42+5
-21x= 58+47
-21x= 105
x= 105/-21