Assuming you mean: 3 - x + -48 = 238 with the dash being a blank, then:
add 48 to both sides
3 - x = 286
subtract 3 from both sides
-x = 283
divide both sides by -1
x = -283
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m= -48
5A2 + 3 = 48 Therefore, 5A2 = 45 Therefore, A2 = 45/5 A = sqrt(9) A = 3
48*3=144
3 times 16 equals 48.
4 x 3 = 12 so 12 + 50x = 250 so 50x=250-12 50x = 238 x = 238/50 x = 4.76