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x-2x-13x-8x+28x=-13+4-3+7-4
8x=17/:8
x=17/8= 2 1/8
Może być źle
x+3 - 2x+ 7 +4 = 13x -13 +8x + 4 -7x
x-2x -13x - 8x+7 x = -13 + 4 -3 - 7 - 4
-15x = -23 / (-15)
x = 1⁸/₁₅
x/2 > x+1/3
x/2-x > ⅓ / *2
x - 2x > ⅔
-x > ⅔ / :(-1)
x< -⅔
rozwiązaniem będzie zbiór (-∞; -⅔ )