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x*0,8=6*0,6
0,8x=3,6
x=4,5
x/3 = 7/ x + 5
x*x=3(7+5)
x²=21+15
x²=36
x=√36
x=6
4/ x + 6 = 5 / 7 + x
4(7+x)=5(x+6)
28+4x=5x+30
4x-5x=30-28
-1x=2
x=-2
x-2/3 = 2x + 7/ 5
5(x-2)=3(2x+7)
5x-10=6x+21
5x-6x=21+10
-1x=31
x=-31
5/ 2m + 5 = 2/ 4m - 1
5(4m-1)=2(2m+5)
20m-5=4m+10
20m-4m=10+5
-16m=15
m=-15/16