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1: -30+25x=(1477/15)x-248/43-223/105
-30+25x=9.8x-5.9-2.1
-30+34.8x=5.9-21
348x=-5.9-21+30
348x=22
x=22/348
x=0.6


2: -1170/1386+28x=13+3108/1457
0.8+28x=13+2.1
28x=13+2.1-0.8
28x=143
x=0.5

3: 48/5+(2/3)x=1657+345
9.6+0.6x=1657+345
0.6x=1657+345-9.6
0.6x=2082.4/0.6
x=3470.6

4:-5040+257896-1247-5x=951753+456
5x095175´+456+5040-257896+1247
5x=700600
5x=700600/5
x=140120

5:(5/3)+(4/3)=2x
9/3=2x
3=2x
3/2=x
1.5=x


6:(6/7)(3/9)+3x=4(17/5)
18/63+3x=4(17/5)
0.2+3x=43.4
3x=0.43
x=0.13

7: (23/3)+(16/9)x=23x-12
767+1.7x=23x-12
7.6+24.7x=-12
247x=-19.6
x=19.6/24.7
x=0.7

8:12x-18+(23/7)=145/2)-4x

12x-18+3.2=72.5
8x=87.3
x=87.3/8
x=10.9


9:(210/18)(125/25)=17/3+3.25x
5250/2250=17/3+3.25x
2.3=5.6+3.25x
2.3-5.6]=3.25
-3.3=3.25x
1.0=x