Раскрой скобки и приведи подобные слагаемые.
1) [tex]3(3x-x-2)-2(6x^{2} -7x-5)[/tex]
2) [tex]9(6+2a^{2}-5a)+4(a-3a^{2} -7)[/tex]
3) [tex]6(3y^{2} +5-2y)-3(5y-3)-2(8y^{2}-1 )[/tex]
4) [tex]3(a^{2} -2a-7)+4(4a-5-2a^{2} )-2(4a-9)[/tex]
5) [tex]3(4y+y^{2}+5)+2(2y^{2}-6-3y)-4(6+5y^{2} )[/tex]
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