Question

a - x+4=12
b - x.7=63
c - x-5=19
d - $\frac{x}{6}$=2
e - x+2=10
f - x-6=-8
g - 3x-21=0
h - 6+x=6,4
i - 0,5x-9=1,5
j - 4x+3=19

Answer 1

a) x + 4 = 12
    x = 12 - 4
    x = 8
____________________
b)
x.7 = 63
7x = 63
x = 63/7
x = 9
________________________
c)
x - 5 = 19
x = 19 + 5
x = 24
____________________
d)
x = 2
6
x = 6.2 
x = 12
_____________________________________
e) 
x + 2 = 10
x = 10 - 2
x = 8
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f) 
x - 6 = - 8
x = - 8 + 6
x = - 2
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g)
3x - 21 = 0
3x = 21
x = 21/3
x = 7
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h)
6 + x = 6,4
x = 6,4 - 6
x = 0,4
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i)
0,5x - 9 = 1,5
0,5x = 1,5 + 9
0,5x =  10,5 (10)
5x = 105
x = 105/5
x = 21
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j) 
4x + 3 = 19
4x = 19 - 3
4x = 16
x = 16/4
x = 4