Question

Preciso urgente
1)10x-40=0
2)4z-2=0
3)5.(3-2a)=55
4)27=3.(x+3)
5)16x+2.(7x+8)-9=67
6)6.(4z+2)+7.(-5z+3)=66
7)12+(3x+6).(-7)-5=70
8)a)10-2x=6+4
B)x-3=6+4x
C)(7x-8).2=6.(3x-4)
D)16x-6-7x=15+2x

Answer 1

1) 10x = 40 ==> x = 40/10 ==> x = 4

2) 4z = 2 ==> z = 2/4 ==> z = 1/2

3) 15 - 10a = 55 ==> -10a = 55-15 ==> -10a = 40 . (-1) ==> 10a = -40 ==> a = -40/10 ==> a = -4

4) 27 = 3x + 9 ==> -3x = 9 - 27 ==> -3x = -18 .(-1) ==> 3x = 18 ==> x = 18/3 ==> x = 6

5) 16x + 14x + 16 - 9 = 67 ==> 30x + 7 = 67 ==> 30x = 67-7 ==> 30x = 60 ==> x = 60/30 ==> x = 2

6) 24z + 12 - 35z + 21 = 66 ==> -11z + 33 = 66 ==> -11z = 66-33 ==> -11z = 33 .(-1) ==> 11z = -33 ==> z = -33/11 ==> z = -3

7) 12 - 21x - 42 - 5 = 70 ==> -21x -35 = 70 ==> -21x = 70 + 35 ==> -21x = 105 . (-1) ==> 21x = -105 ==> x = -105/21 ==> x = 5

8a) -2x = 10 - 10 ==> -2x = 0 .(-1) ==> x = 0

8b) x - 4x = 6 + 3 ==> -3x = 9 .(-1) ==> 3x = -9 ==> x = -9/3 ==> x= -3

8c) 14x - 16 = 18x - 24 ==> 14x -18x = 16 - 24 ==> -4x = -8 .(-1) ==> 4x = 8 ==> x = 8/4 ==> x = 2

8d) 16x - 7x - 2x = 15 + 6 ==> 7x = 21 ==> x = 21/7 ==> x = 3

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