Question

URGENTE POR FAVOR FAVOR COM REPLICAÇÃO​

Answer 1

a) 4(x+1) = 12
4•x + 4•1 = 12
4x = 8 .: x = 2

b) 5(3-x) - 4x = 18
5•3 - 5•x - 4x = 18
15 - 9x = 18
-9x = 18 - 15
-9x = 3
x = -3/9 .: x = -1/3

c) 9x - 3(2x + 2) = 15
9x - 3•(2x) - 3•2 = 15
9x - 6x = 15 + 6
3x = 21 .: x = 7

d) 2,5(x-2) - 1,5x = 1
2,5•x - 2,5•2 - 1,5x = 1
2,5x - 1,5x - 5 = 1
1x = 1 + 5
x = 6

e) 3,5x + 8 = 2(x+7)
3,5x + 8 = 2•x + 2•7
3,5x + 8 = 2x + 14
3,5x - 2x = 14 - 8
1,5x = 6 .: x = 4

f) 6(3x+2) - 8 = -2
6•(3x) + 6•2 - 8 = -2
18x = -2 + 8 - 12
18x = -6
x = -6/18 = -1/3

g) -3(x-5) - 2(2x+1) = -8
-[(3)•x - 5•(3)] - [2•(2x) + 2•1] = -8
-[3x - 15] - [4x + 2] = -8
-3x + 15 - 4x - 2 = -8
-7x = -8 + 2 - 15
-7x = -21 .: x = 3