(17/8-11/20)÷5/46=((17×20-8×11)/160)×46/5=((340-88)/160)×46/5=(252/160)×46/5=(63/20)×23/5=1449/100=14,49
(x+7)^2 + (x-5)^2 =2x^2
x^2+14x+49 + x^2-10x+25-2x^2=0
4х+74=0
4x=-74 x=-18,5
X+1.2+x=16.8
2x+1.2=6.8
2x=5.6
x=2.8
2.8+1.2=3
4(x+1)=15x-7(2x+5)
4x+4=15x-14x-35
4x-15x+14x=-35-4
3x=-39
x=-39/3
x=-13