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7x=210 2x+1+x²=528 3x=732-6 x+3x=60+20 7x=705-5
x= 210÷7 2x+x²=528-1 x=726÷3 4x= 80 x=700÷7
x=30 2x+x²=527 x=242 x=80÷4 x=100
x= 20