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-x +9 = 3x -1 / +x
9= 4x-1/+1
10 = 4x/:4
2,5=x
sprawdzanie;
2 *2,5 +4 -3*2,5 -3 + 8= 3* 2,5 -1
5+4 -7,5 -3+8 = 7,5-1
6,5=6,5
L= P
(lewa strona równa się prawej)
2x + 4 - 3x + 3 + 8 = 3x - 1
-x + 15 = 3x - 1
-x - 3x = -1 - 15
-4x = -16 //:(-4)
x = 4
sprawdzenie:
2 * (4 + 2) - 3 * (4 - 1) + 8 = 3 * 4 - 1
2 * 6 - 3 * 3 + 8 = 12 - 1
12 - 9 + 8 = 11
11 = 11