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(2x+1)/18+(7-x)/9=(2x-1)/6
2x+1+14-2x=6x-3
x=18:6
x=3
b)
(2x-3)/12+(5-x)/4=(2x-6)/3
2x-3+15-3x=8x-24
-9x=-36
x=4
c)
(x+11)/6-(-5-2x)/12=(7+x)/4
2x+22+5+2x=21+3x
x=21-27
x=-6
d)
(x+2)/3-(2x+5)/5=(1-x)/10
10x+20-12x-30=3-3x
x=3+10
x=13
7a)½(x+1)+⅓(x+2)+¼)x+3)<3
6x+6+4x+8+3x+9<36
13x<13
x<1
b)
(x+3)/3-(x-2)/4>(x+3)/2-7/2
4x+12-3x+6>6x+18-42
-5x>-42
x<8,4
c)
⅕(x+1)+⅓(x+2)<1/10(3x-2)+2
6x+6+10x+20<9x-6+60
7x<28
x<4
d)
(x+5)/4-(5x-1)/2>(x+5)/8-6
2x+10-20x+4>x-43
-19x>-57
x<3