1. 18+3x=x+14
18-14=x-3x
-2x=4
x=-2
2. 13x+27=16x+4,5
27-4,5 = 16x-13x
22,5 = 3x
x = 7,5
3. 13x+70=2x+15
13x-2x=15-70
11x = -55
x = -5
№858
1. 2x+7 = x+5,5
2x-x = 5,5-7
x = - 1,5
2) 9,5x+2 = 5,7x - 5,6
9,5x-5,7x = - 5,6 - 2
3.8 x = -7.6
x = -2
3) 2,9x+7,4 = x+1,7
2,9x-x = 1.7-7.4
1,9x = -5.7
x = -3