Question

3x+20=x-4 ? 3x/5+2x=10? 5x+4=12x-8 ?

Answer 1

3x + 20 = x - 4
3x - x = - 4 - 20
2x = - 24
x = - 24/2
x = - 12
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b)
3x + 2x = 10
 5

3x + 5.2x = 5.10
      5             5

3x + 10x = 50
13x = 50
x = 50
      13

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c)
5x + 4 = 12x - 8
4 + 8 = 12x - 5x
12 = 7x
7x = 12
x = 12
       7

Answer 2

a)3x+20=x-4
3x-x=-4-20
2x=-24
x=-12

b)3x/5+2x=10
3x/5+10x/5=50/5
3x+10x=50
13x=50
x=50/13

c)5x+4=12x-8
5x-12x=-8-4
-7x=-12
7x=12
x=12/7