6) 5(x + 2) = 4(3 – x) + 7
5х+10=12-4х+7
5х+4х=9
9х=9
Х=1
7) – 3(5 – 2x) + 4x = 5(x – 3) + 27
-15+6х+4х=5х-15+27
5х=27
Х=5,4
8) 0,4(6x – 7) = 0,5(3x + 7)
2,4х-2,8=1,5х+3,5
0,9х=6,3
Х=7
9) 7(1,4y + 1,8) – 27,6 = 10,1y
9,8у+12,6-27,6=10,1у
-0,3у=15
У=-50
10) – 7(0,3x – 8) + 3(0,4x + 5) = 8
-2,1х+56+1,2х+15=8
-0,9у=-63
У=7