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(4b+6a):2+(12b-3):(-3)=
(20c+4b)-2(5c-15b)=
(-9x+3y)+2(3x-3y)=
(-3x+3)-3(-3x-3)=
-5(-10a-2b)+2a-6b=
(-9c+18b):3+2(-3c+2b)=
(-10x+7y)+9x+3y=
(-3c+2b)+2(-2c+3c)=
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(4b+6a):2+(12b-3):(-3)=
=2b+3a-4b+1 = 3a-2b+1
(20c+4b)-2(5c-15b)=
=20c+4b-10c+30b = 34b + 10c
(-9x+3y)+2(3x-3y)=
= -9x+3y+6x-6y = -3x - 3y
(-3x+3)-3(-3x-3)=
= -3x+3+9x+9 = 6x + 12
-5(-10a-2b)+2a-6b=
= 50a + 10b + 2a - 6b = 52a + 4b
(-9c+18b):3+2(-3c+2b)=
= -3c + 6b - 6c + 4b = 10b - 9c
(-10x+7y)+9x+3y=
= -10x + 7y + 9x + 3y = -x + 10y
(-3c+2b)+2(-2c+3c)=
= -3c + 2b - 4c + 6c = 2b - c