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plug 400 into x
350(400) - 70
350(400) - 70
Step 1: Substitute x = 400 into the expression 350x - 70.
350(400) - 70
Step 2: Perform the multiplication operation first.
140000 - 70
Step 3: Subtract 70 from 140000.
139930
Therefore, when x is 400, the value of 350x - 70 is 139930.