210+х=900÷2-40; х×3-19=350÷50; 1000÷(250-х)=4.

Question

210+х=900÷2-40; х×3-19=350÷50; 1000÷(250-х)=4.

Answer 1

1)210+x=900:2-40
210+x=450-40
210+x=410
x=410-210
x=200