Question

PorFavor me ajudem com essa equações

b-4=3
15=a+20
a-109=5
4x-1=2x+4x-1=3(x-1)
1x-2+4=10+5

Answer 1

b= 3+4
b=7

15= a+20
-a= 20-15
-a= 5 (-1)
a= -5

a-109=5
a= 5+109
a= 114

1x-2+4=10+5
1x=10+5+2-4
1x= 13
x=13/1
x=13

4x-1=2x+8
4x-2x=8+1
2x=9
=9/2

4x-1=3(x-1)
4x-1=3x-3
4x-3x=-3+1
x=-2

Answer 2

b - 4 = 3
b = 3 + 4
b = 7
----------------------------------
15 = a + 20
15 - 20 = a
- 5 = a
a = - 5
----------------------------------------------------
a - 109 = 5
a = 5 + 109
a = 114
-----------------------------------------------------
4x - 1 = 2x + 8
4x - 2x = 8 + 1
2x = 9
x = 9/2
=========================================
4x - 1 = 3(x - 1)
4x - 1 = 3x - 3
4x - 3x = - 3 + 1
x = - 2
----------------------

1x - 2 + 4 = 10 + 5
x + 2 = 15
x = 15 - 2
x = 13