1) 3(х-7)+5х =
3х -21 +5х =
8х =21
х= 2, 625
2)5(4-3х)+8х
20-15х+8х=
-7х = -20
х= 2,9..
3)(у-4)*2+ 10у
2у-8 +10у =
12у =8
у= 0,66..
4)(2у+5)*4-11у
8у +20 -11у=
-3у = -20
у= 6,66..
5)4х+2(0,5х+3)
4х + 1х+6 =
5х = -6
х = -1,2
6)6х-3(х-7)
7х -3х +21
4х = -21
х = - 5,25.