Your Capital Gain will be: $3,125,000 - ($1,470,000+$1,030,000) = $625,000
Since only 1/2 of Capital Gains are taxable, you will have to complete section 3 of Schedule 3 and report $312,500 ($625,000*1/2) as your Taxable Capital Gain.
For more information, please see:
Schedule 3 Tax Form: Capital Gains or Losses in Canada
Claiming Capital Gains and Losses
Example of how to calculate your capital gain
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