Question

18.Simplify: ( 5 −7 X 7 12) + ( −4 9 X 3 −4 ).

Answer 1

$\longmapsto\sf\:(5 - 7 \times 712)+( - 49 \times 3 - 4)$

$\longmapsto \sf \:( - 4979) + ( - 151)$

$\longmapsto \sf \boxed{ - 5130}$

Therefore,the answer is -5130.