Question

Resolva as seguintes equações: A)5x+7-x=-1.

B)2(a-1) 3(a+2)
——– = ——–-
3 5

C)x-(x+1)=2-3(x-2)


D)28,4m-2=54,8

Answer 1

a)
5x+7-x=-1
4x = -1 -7
x = -8/4
x = -2

b)
(2(a-1))/3 = (3(a+2))/5
(2(a-1))5 = (3(a+2))3
10(a-1) = 9(a+2)
10a - 10 = 9a + 18
10a - 9a = 18 + 10
a = 28

c)
x-(x+1)=2-3(x-2)
x - x - 1 = 2 - 3x - 6
-1 - 2 + 6 = -3x
3 = -3x
x = 3/-3
x = -1

d)
28,4m-2=54,8
28,4m =54,8 +2
m = 56,8/28,4
m = 2