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2x+1+2(7-x)=3(2x-1)
2x+1+14-2x=6x-3
15=6x-3
-6x=-18
x=3
2). x+11/6 -5-2x/12 = 7+x/4 I*12
2(x+11)-5-2x=3(7+x)
2x+22-5-2x=21+3x
17=21+3x
-3x=4
x=-¾
3). 1/2(x+1) + 1/3(x+2) + 1/4(x+4)=3 I*12
6(x+1)+4(x+2)+3(x+4)=36
6x+6+4x+8+3x+12=36
13x+26=36
13x=10
x=¹⁰/₁₃