a) 4x + 18 = 2x + 28 f) 7x – 3x = 70 – 30
b) 25x = 50 g) 9y – 25 + y = 32 + 3y – 1
c) 50x = 25 h) 29 + 13b + 5b = 11
d) 3x = 40 + 2x – 7 + 5x – 22 i) x + x + x + 30 = 2x + 3x + 4x
e) 23 – 8y – 15 = – 2y + 26 j) 7a + 35 – 2a – 19 = 5a + 26 – 4a + 20 – 6a
Respostas
Resposta:Segue as contas abaixo na explicação
Explicação passo a passo:
a) 4x + 18 = 2x + 28 b) 25x = 50 c) 50x = 25
4x-2x=28-18 x=50/25 x=25/50:25/25
2x=10 x=2 x=1/2
x=10/2
x=5
d) 3x = 40 + 2x – 7 + 5x – 22 e) 23 – 8y – 15 = – 2y + 26
3x=40+7x-29 8-8y=-2y+26
3x=11+7x -8y+2y=26-8
3x-7x=11 -6y=18
-4x=11 y=18/-6
x=-11/4 y=-3
f) 7x – 3x = 70 – 30 g) 9y – 25 + y = 32 + 3y – 1
4x=40 10y-25=31+3y
x=40/4 10y-3y=25+31
x=10 7y=56
y=56/7
y=8
h) 29 + 13b + 5b = 11 i) x + x + x + 30 = 2x + 3x + 4x
29+18b=11 3x+30=9x
18b=11-29 3x-9x=-30
18b=-18 -6x=-30 (-1)
b=-18/18 6x=30
b=-1 x=30/6
x=5
j) 7a + 35 – 2a – 19 = 5a + 26 – 4a + 20 – 6a
5a+16=5a-10a+46
5a+16=-5a+46
5a+5a=46-16
10a=30
a=30/10
a=3