a,7(x-2)=5(3x+1)
<=>7x-14=15x+5
<=>7x-15x=5+14
<=>-8x=19
<=>x=-19/8
f,x-3=18-5x
<=>x+5x=18+3
<=>6x=21
<=>x=7/2
i,5x-4/2=16x+1/7
<=>7(5x-4)=2(16x+1)
<=>35x-28=32x+2
<=>35x-32x=2+28
<=>3x=30
<=>x=10
l,2x+1/6-x-2/4=3-2x/3-x
<=>2(2x+1)-3(x-2)=4(3-2x)-12x
<=>4x+2-3x+6=12-8x-12x
<=>4x-3x+8x+12x=12-2-6
<=>9x=4
<=>x=4/9
o,1+2x-5/6=3-x/4
<=>12+2(2x-5)=3(3-x)
<=>12+4x-10=9-3x
<=>4x+3x=9-12+10
<=>7x=7
<=>x=1
l,x+1/2=x-2/3
<=>3(x+1)=2(x-2)
<=>3x+3=2x-4
<=>3x-2x=-4-3
<=>x=-7
t,3(2x+1)/4-5-3x+2/10=2(3x-1)/5
<=>5.3(2x+1)-20.5-2(3x+2)=4.2(3x-1)
<=>30x+15-100-6x-4=24x-8
<=>30x-6x-24x=-8-15+100+4
<=>0x=81
b,y(y-1/2)(2y+5)=0
=>y^2-1/2x)(2y+5)
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