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4x + 24 - 8 = 2x + 12
4x - 2x = 12 - 24 + 8
2x = -4 /:2
x = -2
4x+24-8=2x+12
4x+16=2x+12
-2x+4x=-16+12
2x=4 / :2
x=2
Odp: rozwiązaniem równania jest liczba x=2