Question

Tentukan nilai variabel dari persamaan berikut !
a) 7x-4=2x+16
b) 5(3-x)=6-2x
c) 3x-2(5x+1)=(2x+7)
d) 5x/2 = 2/3
e) 2/(x-9)-9/(x+12)

Answer 1

7x-4=2x+16
⇔7x-2x=16+4
⇔5x=20
⇔5x/5=20/5
⇔x=4
5(3-x)=6-2x
⇔15-5x=6-2x
⇔-5x+2x=6-15
⇔-3x=-9
⇔-3x/-3=-9/-3
⇔x=3
3x-2(5x+1)=2x+7
⇔3x-10x-2=2x+7
⇔-7x-2x=7+2
⇔-9x=9
⇔-9x/-9=9/-9
⇔x=-1
5x/2=2/3
⇔5x.3=2.2
⇔15x=4
⇔15x/15=4/15
⇔x=4/15
2/(x-9)=9/(x+12)
⇔2(x+12)=9(x-9)
⇔2x+24=9x-81
⇔2x-9x=-81-24
⇔-7x=-105
⇔-7x/-7=-105/-7
⇔x=15
Semangat!