Question

A)8x-15=3x+15
B)7x+16=3x+5
C)-4x+12=8x-18
D)12x+25= -13x+200

Answer 1

a.8x-3x=30
5x=30
x=6
b.4x=-11
x=-11/4
c.30=12x
x=30/12
x=5/2
d.25x=175
x=7

Answer 2

A)
8x - 15 = 3x + 15
8x - 3x = 15 + 15
5x = 30
x = 30/5
x = 6

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B)
7x + 16 = 3x + 5
7x - 3x = 5 - 16
4x = - 11
x = -11/4

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C)
- 4x + 12 = 8x - 18
12 + 18 = 8x + 4x
30 = 12x
12x = 30
x =   30  (:6)
       ------
         12 (:6)

x = 5/2

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D)
12x + 25= - 13x + 200
12x + 13x = 200 - 25
25x = 175
x = 175/25
x = 7