1)
-6*(-5-7х)=-8х+2,
30 + 42x = - 7x + 2,
42x + 7x = - 30 + 2,
49x = - 28,
x = - 4/7,
2)
9+2(2х+1)=1,
9 + 4x + 2 = 1,
4x = 1 - 9 - 2,
4x = - 10,
x = - 2,5.
3)
4+3(10х+7)=-5,
4 + 30x + 21 = - 5,
30x = - 5 - 4 - 21,
30x = - 30,
x = - 1,
4)
-4(-7+6х)=-9х-5,
28 - 24x = - 9x - 5,
-24x + 9x = - 28 - 5,
-15x = - 33,
x = 2,2