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Answer :

[tex]-10u^3-15u^3+5u^3=-20u^3[/tex]

[tex]-5u^3\cdot \:10u^3+\left(-5u^3\right)=-50u^6-5u^3[/tex]

[tex]5u^3\cdot \:10u^3+5u^3=50u^6+5u^3[/tex]

[tex]15u^3\cdot \:5u^3+\left(-10u^3\right)=75u^6-10u^3[/tex]