a, -(-3x+8)-7(x-10)=-(2x+30)-6
<=>3x-8-7x+70=-2x-30-6
<=>3x-8-7x+70+2x+30+6=0
<=>-2x+98=0
<=>-2x=-98
<=>x=49
b,2(-10-3x)+3(2x-5)=-x-(-2)^3
<=>-20-6x+6x-15=-x+8
<=>-20-6x+6x-15+x-8=0
<=>x-43=0
<=>x=43
e,-(18-20x)+(15-18x)=-5^2+4x
<=>-15+20x+15-18x=-25+4x
<=>-15+20x+15-18x+25-4x=0
<=>-2x+25=0
<=>-2x=-25
<=>x=25/2
h,-3(x+2)-5=-(-4)-(4x-3)
<=>-3x-6-5=4-4x+3
<=>-3x-6-5-4+4x-3=0
<=>x-18=0
<=>x=18
k,-8(2x+3)=-7(2x+5)-(-20)
<=>-18x-24=-14x-35+20
<=>-18x-24+14x+35-20=0
<=>6x-9=0
<=>6x=9
<=>x=3/2
