Question

Помогите решить:-7х-4=-9х+6;-0,3 (х-2)=0,6+0,2 (х-4);(15,54÷(-4,2)-2,5)×1,4+1,08;

Answer 1

-7х-4=-9х+6
-7х+9х=6+4
2х=10
х=10:2
х=5

-0,3 (х-2)=0,6+0,2 (х-4)
-0.3х+0.6=0.6+0.2х-0.8
-0.3х-0.2х=0.6-0.8-0.6
-0.5х=-0.8
х=-0.8:(-0.5)
х=1.6

(15,54÷(-4,2)-2,5)×1,4+1,08=-7.6
15.54:(-4.2)=-3.7
-3.7-2.5=-6.2
-6.2*1.4=-8.68
-8.68+1.08=-7.6