Question

3(x-4)=5x
-5(7-x)=6 (x+2)=
2(0,2x-3)-8(0,7x-4)=39
0,5(3x-4)+4,4=0,9(4x-2)=

Answer 1

1) 3 (х-4)=5х
3х-12-5х=0
-2х=-12
х= -12÷ (-2)
х= 6
2) -5 (7-х)=6 (х+2)
-35+5х=6х+12
-35+5х-6х-12=0
-х=-47/1
х=47
3) 2 (0.2х-3)-8 (0.7х-4)=39
0.4х-6-5.6х+32-39=0
-5.2х-13=0
х=-13÷(-5.2)
х= 2.5
4) 0.5 (3х-4)+4.4=0.9 (4х-2)
1.5х-2+4.4-3.6х+1.8=0
2.1х+4.2=0
х=4.2÷ 2.1
х= 2