(4+9)+(5−1242) = −1224 (I assume m stands for metres?)
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1 - 5x + 7x is an expression, not an equation (no equals sign), so you cannot solve for x. You can, however simplify (combine like terms) and get 1 + 2x.
To solve an equation with three unknowns, x, y and z, you require 3 independent equations.
you can not solve this equation
27
3q + 5 + 2q + 5 = 65 5q + 10 = 65 5q = 55 q = 11 Check it. 33 + 5 + 22 + 5 = 65 It checks.