Question

cum se rezolva exercitiile

Answer 1

(2x+5)×7-35=70
(2x+5)×7=105
2x+5=15
2x=10
x=5

(x+7)×12-24=120
(x+7)×12=144
x+7=12
x=19

(x-5):20+155=160
(x-5):20=5
x-5=100
x=105

[9+(x-8)×9]×9=810
9+(x-8)×9=90
(x-8)×9=81
x-8=9
x=17

(5x-20)×4-20=400
(5x-20)×4=420
5x-20=105
5x=125
x=25