Question

Помогите 671,673,674

Answer 1

#671
-3х+4= -10+5(-7-х)
-3х+4= -10-35-5х
-3х+5х= -10-35-4
2х= -49
х= -24,5

#673
5х-4=4-3(5-2х)
5х-4=4-15+6х
5х-6х=4+4-15
-х= -7
х=7

#674
4-2(5+4х)= -х+1
4-10-6х= -х+1
-6х+х=1-4+10
-5х=7
х= -1,4