Odpowiedź :
Odpowiedź:
1.
-x +28 +2x =13
x = 13 - 28 = -15
2.
18 - 12x - 3 = 17 - 2x
-12x + 2x = 17 - 15
-10x = 2 /:(-10)
x = -1/5
3.
3x + 8x =12
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4
11/4x = 3 /*4/11
x = 12/11 = 1 1/11
4.2x - 5 =1
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3
1,4x - 5/3 = 1/3
1,4x = 1/3 + 1 2/3
1,4x = 2 /:1,4
x = 2 : 14/10 = 2 : 7/5 = 2 * 5/7 = 10/7 = 1 3/7
5 * (-2) * 5x = 7 - 3x
-10 *5x = 7 - 3x
-50x + 3x = 7
-47x = 7 /:(-47)
x = -7/47
Szczegółowe wyjaśnienie: