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  • algebra - ,

    If you are expected to solve for x, first multiply 0.7x * 4.

    2.8x = 0.8x - 7

    Subtract 0.8x from both sides of the equation to get x on one side. Whatever operation you do to one side of an equation you must do to the other side as well.

    2.8x - 0.8x = 0.8x - 0.8x - 7

    2x = -7

    Now divide both sides by 2 to get x by itself.

    2x/2 = -7/2

    x = -7/2 = -3.5 (decimal form)

    You can check this answer with the original equation. It always helps to check your work!

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