Question

calculo completo das equações:
a) 5x-7=3x-10
b)15x-13=-39-11x
c)7x+11=15+5x
d)7,2x-o,48=0,48+4,8x
e)21+9x=15x+33
f)2x+0,8-3,5=x
g)16-11x+12=-15x
h)23-2x=x+25

Answer 1

a) 5x - 3x = -10 + 7 => 2x = - 3 => x = -3/2

b) 15x + 11x = -39 + 13 => 26x = -26 => x = - 1

c) 7x - 5x = 15 - 11 => 2x = 4  => x = 2

d) 7,2 x - 4,8x = 0,48 + 0,48 => 2,4x = 0,96  => X = 0,4

e) 9x - 15x = 33 - 21 => - 6x = 12  =>  x = - 2

f) 2x - x = -0,8 + 3,5 => x = 2,7

g) -11x + 15x = -28  => 4x = -28 => x = -7

h) -2x - x = 25 - 23  => -3x = 2  => x = - 3/2 ou 

Answer 2

a)5x-7=3x-10
5x-3x=-10+7
2x=-3
x=-3/2
b)15x-13=-39-11x
15x+11x=-39+13
26x=-26
x=-26/26
x=-1
c)7x+11=15+5x
7x-5x=15-11
2x=4
x=4/2
x=2
d)7,2x-0,48=0,48+4,8x
7,2x-4,8x=0,48+0,48
12x=0,96
x=0,96/12
x=0,08
e)21+9x=15x+33
9x-15x=33-21
-6x=12(-1)
x=-12/6
x=-2
f)2x+0,8-3,5=x
2x-x=3,5-0,8
x=2,7
g) 16-11x+12=-15x
-11x+15x=-16-12
4x=-28
x=-28/4
x=-7
h)23-2x=x+25
-2x-x=25-23
-3x=2(-1)
x=-2/3