<span>1/2*(4-3 1/2x)-1 1/4x+1/2=0
2-1 3/4x-1 1/4x+1/2=0
-1 3/4x-1 1/4x=-2-1/2
-3x=-2 1/2
x=-2 1/2:(-3)
x=-5/2*(-1/3)
x=5/6
</span>3*(5-x)+13-4*(3x-8)=0
<span>15-3х+13-12х+32=0
-3х-12х=-32-13-15
-15х=-60
х=-60:(-15)
х=4
</span>
1/7х=1 9х=1 1 5/8х=1
х=1:1/7 х=1:9 х=1:1 5/8
х=7 х=1/9 х=8/13
248 - х * 36 = 176
248 - 36х = 176
-36х = 176 - 248
-36х = -72
х = -72 : (-36)
х = 2
Ответ: х = 2