Решите уравнения: 1) 3x-x=12
2)x+8x=72
3)9x+x-9x=5
4) 4x+3x-7x=6
Вот образец заполнения:
15x-8x=21
7x=21
X=21÷7
X=3
Ответ: x=3
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