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x/4+4 = 7-(z/4) // - 7-(z/4)
x/4+z/4-7+4 = 0
1/4*x+1/4*z-3 = 0 // - 1/4*z-3
1/4*x = -(1/4*z-3) // : 1/4
x = (-(1/4*z-3))/1/4
x = 4*(3-(1/4*z))
x = 4*(3-(1/4*z))
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