Решите уравнение(Плиз помогите даю 20 баллов)
А) 15х-8х=56
б) 4f+2f=42
в) 6a+a-6a=66
г) 5t+2t-7t=7
д) 6а -3а-2а+45=81
е) 7b+4b-10b-37=54
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