Question

1) 3x+2= 81
2) (2x-3). (4x+4)= 0
3) 7x-2= -7
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Answer 1

1) 3x + 2= 81
3x = 81-2
3x = 79
x = 79/3
x = 26,3

2) (2x-3) . (4x +4)=0
2x.4x = 3-4
8x = -1
x= -1/8 (-1)
X = 1/8

3)7x-2 = -7
7x = -7 +2
7x = -5
x = -5/7. (-1)
X = 5/7