(3500-х):2=1000 (х+5)*2=400-100 3500-х=1000*2 х+5=(400-100):2

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вопрос

(3500 - x) ÷ 2 = 1000
(х + 5) 2 = 400 - 100
3500 - x = 1000 2
х + 5 = (400 - 100) ÷ 2

Solving the equations:
(3500 - x) ÷ 2 = 1000
1750 - x = 1000
-x = 1000 - 1750
-x = -750
x = 750

(х + 5) * 2 = 400 - 100
2x + 10 = 300
2x = 290
x = 145

3500 - x = 1000 * 2
3500 - 145 = 2000
3355 = 2000

х + 5 = (400 - 100) ÷ 2
145 + 5 = 150 ÷ 2
150 ÷ 2 = 75

Therefore, x = 145 and the solution is verified.