6 · (5х + 2) + 3 · (7х - 2) = 30х + 12 + 21х - 6 = (30х + 21х) + (12 - 6) =
= 51х + 6.
<span>1) |0,6+x|=7
0.6+х=7
х=7-0.6
х=6.4
2) |0,4x-1|=2
0.4х-1=2
0.4х=2+1
0.4х=3
х=3/0.4
х=0.75
3) |0,5x+3|=5
0.5х+3=5
0.5х=5-3
0.5х=2
х=2/0.5
х=0.4
4) |2,5x-3|=7
2.5х-3=7
2.5х=7+3
2.5х=10
х=10/2.5
х=4
5) |0,2x+7|=8
</span><span> 0.2х+7=8
0.2х=8-7
0.2х=1
х=1/0.2
х=0.5</span>
1) 2222-222+22:2+2=2013
<span>2) 333*(3+3)+3*3+3+3=2013</span>