№655.
-6(9-5х) = 9х+9
-54+30х = 9х+9
30х-9х = 9+54
21х = 63
х = 63:21
х = 3
№656.
-3(1+4х) = - 4х-5
-3+(-12х) = - 4х-5
-12х+4х = - 5+3
-8х = - 2
-х = - 2:8
-х = - 0,25
х = 0.25
№657.
-6(-5-7х) = - 8х+2
30+42х = - 8х+2
42х+8х = 2-30
50х = - 28
х = -0.56
№659.
4+3(10х+7) = - 5
4+30х+21 = - 5
30х+25 = - 5
30х = - 5 - 25
30х = - 30
х = - 30 : 30
х = - 1
№660.
4+5(-3х+7) = - 9
4+(-15х)+35 = - 9
-15х+39 = - 9
-15х = - 9-39
-15х = - 48
-x = - 48:15
-x = - 3.2
x = 3.2
№662.
-7+2(7х-2) = 10
-7+14х-4 = 10
14х-11 = 10
14х = 10+11
14х = 21
х = 21:14
х = 1.5
№663.
-7-2(5х-6) = - 2
-7-10х+12 = - 2
5-10х = - 2
-10х = - 2-5
-10х = - 7
-х = - 7:10
-х = -0,7
х = 0.7