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1)
- 5x + 8x + x - 15 + 12x = 16
3x + x + 12x - 15 = 16
4x + 12x - 15 = 16
16x = 16 + 15
16x = 31
x = 31/16
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2)
9x - 7x + 2 = - 4x - 1
2x + 2 = - 4x - 1
2x + 4x = - 1 - 2
6x = - 3
x = - 3:3/6:3
x = - 1/2
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3)
- 3(x + 1) - 4x - 1 = 0
- 3x - 3 - 4x - 1 = 0
- 3x - 4x - 3 - 1 = 0
- 7x - 4 = 0
- 7x = - 4
7x = - 4 (-)
7x = 4
x = 4/7
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4)
2(x + 3) = - 3(x - 1)
2x + 6 = - 3x + 3
2x + 3x = 3 - 6
5x = 3
x = 3/5