помогите очень срочно !
12a-3d ÷ 12a+3d при a= - 3/4 d= -5/6

уравнение
2x - 12 (3-x)= 1+3 (x+2)
16+5 (-c-2 (c-4)) = 12 (3-2c)-1
упростить
13b-(9b-(8b-(6-b))) =
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