Question

Resolva as equações abaixo, observando cada conjunto Universo:


7) 3 (x+1)+2 (2x-3)=5 (x-1)+8; U=Q


8) 3-7 (1-2x)=5-(x+9); U=Q


9) (1+3x)-(1-2x)+(-11-7x)=5; U=Z


10) 2 (2x+7)+3 (3x-5)=3 (4x+5)-1; U=Q


11) x-3 (4-x)=7x-(1-x); U=Z


12) 2 (1-5x)+3 (-1-x)-4 (-7+2x)=-x; U= Z


13) 5 (2x+7)-1=4 (x-5)+9; U=Z


14) 2 (x-1)+3 (x+1)=4 (x+2); U=Q


15) 2 (2x+3)+5 (x-1)=8-3 (x-1); U=Z

Answer 1

7) 3 (x+1)+2 (2x-3)=5 (x-1)+8; U=Q
3x +3 +4x -6 = 5x -5 +8
2x = 6
x = 6/2
x= 3


8) 3-7 (1-2x)=5-(x+9); U=Q
3 -7 +14x = 5 -x -9
13x = 0


9) (1+3x)-(1-2x)+(-11-7x)=5; U=Z



10) 2 (2x+7)+3 (3x-5)=3 (4x+5)-1; U=Q
4x +14 +9x -15= 12x +15 -1
x =15


11) x-3 (4-x)=7x-(1-x); U=Z
x -12 +3x = 7x -1 +x
-4x = 11
4x = -11
x = -11/4

12) 2 (1-5x)+3 (-1-x)-4 (-7+2x)=-x; U= Z

13) 5 (2x+7)-1=4 (x-5)+9; U=Z
10x +35 -1 = 4x -20 + 9
6x = - 45
x = -45/6


14) 2 (x-1)+3 (x+1)=4 (x+2); U=Q

15) 2 (2x+3)+5 (x-1)=8-3 (x-1); U=Z