\(\left(7x+15\right)-\left(2x-6\right)-21=-125\)
\(\Leftrightarrow7x+15-2x+6=-104\)
\(\Leftrightarrow5x+21=-104\)
\(\Leftrightarrow5x=-125\)
\(\Leftrightarrow x=-25\)
(7x+15)-(2x-6)-21=-125
<=>7x+15-2x+6-21=-125
<=>5x=-125
<=>x=-25
Vậy x=-25
hok tốt
\(7x-2x=6^{17}:6^{15}+44:11\)
\(7x-x=5^{21}:5^{19}+3.2^2-7\)
1. 6x+x=5^11:5^9+3
2. 7x-x=5^21:5^19+3x4-1
3. 7x-2x=6^17:6^15+44:11
a,7x-5=16
b,156-2x=82
c,10x+65=125
d,8x+2x=25x22
e,15+5x=40
f,5x+2x=62-1
Bài 1:Tìm x
a) 5x+x=39-3^11:3^9
b) 7x-x=5^21:5^19+3.2^2-7^0
c) 7x-2x =6^17:6^15+44:11
a,7x-5=16
b,156-2x=82
c,10x+65=125
d,8x+2x=25x22
e,15+5x=40
f,5x+2x=62-1
a.7.x-x=5 mũ 21:5 mũ 19+3.2 mũ 2-7 mũ 0
b.7x-2x=6 mũ 17:6 mũ 15+44:11
a, 5x+x=39-311 :39
b,7x-x=521:519+3x22-70
c,7x-2x=617:615+44:11
tìm x, biết:
a, 5x + x = 39-311:39
b, 7x - x = 521:519+3.22-70
c, 7x - 2x = 617:615+44:11
a) -12+x=5x-20
b) 4x-10=15-x
c) 7x-4=20+3x
d) 3x-6=5x+2
e) 5x-7=-21-2x
f) 15-x=4x-5
g) x+15=20-4x
