Упростите:7,8(3х-5)+(80-39у)-0,3(10+78х-130у)=

Question

Упростите:
7,8(3х-5)+(80-39у)-0,3(10+78х-130у)=

Answer 1

7.8(3х-5)+(89-39у)-0.3(10+78х-130у)=23.4х-39+80-39у-3-23.4х+39у=-39+80-3=-42+80=38.