-(5х-10х) +18*(5х-10)+15х=5
- ( - 5х ) + 18( 5x - 10 ) + 15x = 5
5x + 90x - 180 + 15x = 5
110x = 5 + 180
x = 185 : 110
x = 1 75/110
x = 1 15/22
--------------------------------------------
<span>
-(4х+34)-х+39+10х=74
- 4x - 34 - x + 39 + 10x = 74
5x = 74 - 5
x = 69 : 5
x = 13,8
</span>
1) x*60=6907+43493
x*60=50400
x=50400:60
x=840
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840*60=6907+43493
50400=50400
Ответ: x=840
2) 40450:x=7621-7571
40450:x=50
x=40450:50
x=809
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40450:809=7621-7571
50=50
Ответ: x=809