中2 等式の変形(かっこを含む式) _1

( )内の文字について解け。
2(a+b)=8 (a)
a=-b+4 32(x-4y)=A (x)
x=2A3+4y x(m+2n)=y-4 (n)
n=-m2+y2x-2x 3(2x+5c)=A+3y (c)
c=A15-2x5+y5 5(3a+b)=4x-3y (a)
a=-b3+4x15-y5 23(2x-by)=c-12 (x)
x=by2+3c4-9 5(ab+2c)=10x (a)
a=-2cb+2xb a(4x-y)=2bc (x)
x=bc2a+y4