Answer:
z = -7
x = 1.6
There is no equation in what you typed on the third lie so it cannot be solved (equal sign is missing)
x = - 132/7
Step-by-step explanation:
For all cases the goal is to isolate the unknown (represented by a letter) on one side of the equal sign by using mathematical operations simultaneously on both sides.
In the first equation, to isolate z we need to subtract 4 from both sides:
[tex]-3=z+4\\-3-4=z+4-4\\-3-4=z\\z=-7[/tex]
In the second equation: in order to isolate x we need to get rid of the factor 4 that is multiplying x, therefore we use the division by 4 on both sides:
[tex]6.4=4x\\\frac{6.4}{4}=\frac{4x}{4} \\1.6=x[/tex]
The third expression you wrote doesn't contain an equal sign and therefore it s not an equation (cannot be solved)
In the last equation, in order to isolate x we need to divide both sides by 7 and also to multiply both sides by 33:
[tex]-4=\frac{7}{33} x\\\frac{-4*33}{7} =\frac{7*33}{33*7} x\\\frac{-132}{7} = x\\x=-\frac{132}{7}[/tex]
