розкрий дужки і зведи подібні доданнки
1) 5(3а-2)+3(4-5а)
2)-4(2t-x)+3(x-5t)
3)(4a-2)*0,5+(3-5a)*(-0,4)
4)1,5(2a-t)-2,5(4a+3t)
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