Ответы на вопрос:
1) 4х - 12.8 = 0 4х = 12.8 | : 4 х = 3.2 2) 7х - 9 = 3х + 7 7х - 3х = 7 + 9 4х = 16 | : 4 х = 4 3) 1.6 (5х - 1) =1.8-4.7 8 х - 1.6 = - 2.9 8х = -1.3 | : 8 х = - 0.16
3(0,7x + y) - 5(3x - y) = 2,1x + 3y - 15x + 5y = - 12,9x + 8y
- 12,9 * 5 + 8 * 3,8 = - 64,5 + 30,4 = - 34,1
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