7*(4+x)-(3c-5) при с=3/4

Question

7*(4+x)-(3c-5) при с=3/4

Answer 1

7(4+х)-(3с-5)=28+7х-3с+5=33+7х+3с
Если с=3/4, то 33+7х+3с=33+7х+3•3/4=
=33+7х+2,25=35,25+7х

Answer 2

28+7x-3c+5=33+7x-3·3/4=33+7x-2,25=30,75+7x
30,75+7x=0
7x=-30,75
x=-4,25