3(5-4a)-(12a-7)=15-12а-12а+7=-24а+22
(3х-2)<span>^3=(3x)^3-3(3x)^2*2+3*3x*2^2-2^3=27x^3-54x^2+36x-8</span>
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(x+5)*29=638
x+5=638\29
x+5=22
x=22-5
x=17