Simplify (-8z+4) + (7z-7) (5x+6) - (x+4)
(7y+5) - 2(4y-3)
-2(a+4) - 2(4.5a-7)
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Type the correct answer in the box. consider the system of linear equations below. rewrite one of the two equations above in the form ax + by = c, where a, b, and c are constants, so that the sum of the new equation and the unchanged equation from the original system results in an equation in one variable.