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anactasuy
@anactasuy
August 2022
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помогите решить номер 90
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jekadva
5(x-3)-2(x-7)+7(2x+6)=7
5x-15-2x+14+14x+42=7
17x+41=7
17x=7-41
17x=-34
x=-34/17
x=-2
=========================
11(y-4)+10(5-3y)-3(4-3y)=-6
11y-44+50-30y-12+9y=-6
-10y-6=-6
-10y=-6+6
-10y=0
y=0
=============================
5(8z-1)-7(4z+1)+8(7-4z)=9
40z-5-28z-7+56-32z=9
-20z+44=9
-20z=9-44
-20z=-35
z=-35:-20
z=1,75
----------==============================
10(3x-2)-3(5x+2)+5(11-4x)=25
30x-20-15x-6+55-20x=25
-5x+29=25
-5x=25-29
-5x=-4
x=-4:-5
x=0,8
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Answers & Comments
5x-15-2x+14+14x+42=7
17x+41=7
17x=7-41
17x=-34
x=-34/17
x=-2
=========================
11(y-4)+10(5-3y)-3(4-3y)=-6
11y-44+50-30y-12+9y=-6
-10y-6=-6
-10y=-6+6
-10y=0
y=0
=============================
5(8z-1)-7(4z+1)+8(7-4z)=9
40z-5-28z-7+56-32z=9
-20z+44=9
-20z=9-44
-20z=-35
z=-35:-20
z=1,75
----------==============================
10(3x-2)-3(5x+2)+5(11-4x)=25
30x-20-15x-6+55-20x=25
-5x+29=25
-5x=25-29
-5x=-4
x=-4:-5
x=0,8