Question

me ajudem por favor preciso pra hoje​

Answer 1

a) x + x + x = 87
3x = 87
3x/3 = 87/3
X = 29

b) x - 2x + 4x = 81
x + 2x = 81
3x = 81
3x/3 = 81/3
X = 27

c) 47 + 38 + x = 110
85 + x = 110
x = 110 - 85
x = 25

d) -47x = 611
-47x = 611 . (-1)
47x = -611
47x/47 = -611/47
X = -13

e) -10x = 10
-10x = 10 . (-1)
10x = -10
10x/10 = -10/10
X = -1

f) -30x = 900
-30x = 900 . (-1)
30x = -900
30x/30 = -900/30
X = -30

g) 2 - 3x = -9 -4x
-3x + 4x = -9 -2
X = -11

h) -4 + 5 = 7x -5 - 6x
1 = x -5
1 + 5 = x
6 = X

i) 4.(x + 1) = 12
4x + 4 = 12
4x = 8
4x/4 = 8/4
X = 2

j) 9.(x - 3) + 1 = 18
9x -27 + = 18
9x = 18 + 27
9x = 45
9x/9 = 45/9
X = 5

k) 5(3 - x) = 4x + 18
15 - 5x = 4x + 18
-5x -4x = 18 - 15
-9x = 3
-9x = 3 . (-1)
9x = 3
9x/9 = 3/9
X = 3/9
X = 1/3 ( simplificando )