і. 4х – 8 = 0
1. 7x – 28 = 0
Respuestas a la pregunta
Respuesta:
) 7х = -30 + 2х;
7х - 2x = - 30
5x = - 30
x = - 6
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5) 0,2х + 4,3 = 0,4х - 6,5;
0,4x - 0,2x = 4,3 + 6,5
0,2x = 10,8
x = 54
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2) 16 - 18х = -25x - 12;
25x - 18x = - 12 - 16
7x = - 28
x = - 4
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6) 0,6х + 100 = 0,9x + 1;
0,9x - 0,6x = 100 - 1
0,3x = 99
x = 330
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3) -17х + 20 = 7х - 28;
7x + 17x = 20 + 28
24x = 48
x = 2
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7) -9/14 х + 18 =-2/3 х + 17;
- 9/14x + 2/3x = 17 - 18
- 27/42x + 28/42x = - 1
1/42x = - 1
x = - 42
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4) 20 - 2х = 27 + х;
x + 2x = 20 - 27
3x = - 7
x = - 7/3
x = - 2 1/3
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8) -8/15 х -11 = 4/9 х + 11.
- 8/15x - 4/9x = 11 + 11
- 24/45x - 20/45x = 22
- 44/45x = 22
x = 22 : ( - 44/45 )
x = - 45/2
x = - 22 1/2