1)
4x + 5 = 6 + 5*(x - 3)
4x + 5 = 6 + 5x - 15
4x + 5 = -9 + 5x
5x - 4x = 5 + 9
x = 14
при x = 14
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2)
4x + 6 - 3 * ( x + 1 ) = 5 - 2 * ( x - 3)
4x + 6 - 3x - 3 = 5 - 2x + 6
x + 3 = 11 - 2x
x + 2x = 11 - 3
3x = 8
x = 8 : 3
x = 2 2/3
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3)
2*(x + x+1 + x+2) = 18
2*(3x+3) = 18
3x + 3 = 18 : 2
3x + 3 = 9
3x = 9 - 3
3x = 6
x = 6 : 3
x = 2 первое число
2+1=3 второе число
2+2 = 4 третье число
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4)
3 + (x - 3)/2 = (x+5)/6 //*6
18 + 3x - 9 = x + 5
9 + 3x = x + 5
3x - x = 5 - 9
2x = -4
x = -4 : 2
x = -2
приx = -2
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