2х+4*(20-х)=100 4х+2*(40-х)=100помогите плизз

Question

2х+4*(20-х)=100 4х+2*(40-х)=100
помогите плизз

Answer 1

2х+4*(20-х)=100
2х + 80 - 4х = 100
-2х = 100 - 80
-2х = 20
х = 20 / -2
х = -10

4х+2*(40-х)=100
4х + 80 - 2х = 100
2х = 100 - 80
2х = 20
х = 20 / 2
х = 10

Comments

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Answer 2

2х+4*(20-х)=100
2х+80-4х=100
-2х=20
х= -10
_______________
4х+2*(40-х)=100
4х+80-2х=100
2х=20
х=10