40 = 0.5r
40/0.5 = r
80 = r
just divide the number in front of the r so that you can figure it out
(-2)(3*4+2(-2)(-5)) = -2(12+20) = -2(32) = -64
X=-3
because
-4x=21-9
-4x= 12 divide both sides
x=-3
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