1)
22*(4x+1)=11*50
88x+22=550
88x=550-22
88x=528
x=528:88
x=6
======
2)
39*(8x-5)=57*13
312x-195=741
312x=741+195
312x=936
x=936:312
x=3
=====
3)
72*(4x+7)=60*18
288x+504=1080
288x=1080-504
288x=576
x=576:288
x=2
=======
4)
45*(5x-6)=70*9
225x-270=630
225x=630+270
225x=900
x=900:225
x=4
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