1) 3x - 9 = 0
⇔ 3( x - 3 ) = 0
⇔ x - 3 = 0
⇔ x = 3
2) -0.5x + 2.4 = 0
⇔ -0.5( x - 4.8) = 0
⇔ x - 4.8 = 0
⇔ x = 4.8
3) 1 - 2t = 0
⇔ 2( 0.5 -t) = 0
⇔ 0.5 - t= 0
⇔ t=0.5
4) 3x - 11 = 0
⇔ 3( x-11/3) = 0
⇔ x - 11/3 = 0
⇔ x = 11/3
5) 2x - (3-5x)= 4(x+3)
⇔ 2x -3 +5x= 4x + 12
⇔3x -15 = 0
⇔ x=5
6) $\frac{5x-2}{3 }$ +x= 1 + $\frac{5-3x}{2}$
⇔ $\frac{8x-2}{3}$ = $\frac{7-3x}{2}$
⇔ 16x -4= 21-9x
⇔ 25x = 25
⇔ x=1
7) ⇔ $\frac{3x^2+5x-2}{3}$ - $\frac{2x^2+1}{2}$ = $\frac{11}{2}$
⇔ 10x -7=33
⇔ x= 4
8) ⇔ $\frac{x-2}{6}$ = $\frac{7-3x}{4}$
⇔ 2x -4= 21-9x
⇔ 11x = 25
⇔ x=$\frac{25}{11}$
9) ⇔ 5x= 15
⇔ x=3
10) 5x -12= 2x +24
⇔ 3x = 36
⇔ x=12
