Question

Rezolva ecuaţia 120+5*[28-3*(2x-140:7)]=140

Answer 1

120 + 5 * [ 28 - 3 * ( 2x - 140 : 7 ) ] = 140
120 + 5 * [ 28 - 3 * ( 2x - 20 ) ] = 140
5 * [ 28 - 3 * ( 2x - 20 ) ] = 140 - 120 = 20
28 - 3 * ( 2x - 20 ) = 20 : 5
28 - 3 * ( 2x - 20 ) = 4
3 * ( 2x - 20 ) = 28 - 4
3 * ( 2x - 20 ) = 24
2x - 20 = 24 ÷ 3 = 8
2x = 20 + 8
2x = 28
x = 28 ÷ 2
x = 14.

Answer 2

120+5*[28-3*(2x-140:7)]=140
5*[28-3*(2x-140:7)]=20
28-3*(2x-140:7)=4
3*(2x-140:7)=24
2x-140:7=8
2x-20=8
2x=28
x=14


Sper ca te-am ajutat ! :)