5/7=x/63
Cross-multiply.
5*63=x*7
Divide by 7, isolating the x:
5*63/7=x
Simplify.
5*63/7=5*9=45
x=45
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5/7 + 7/9 = 45/63 + 49/63 = 94/63 or 1 31/63
-100/63 ÷ 10/81 = -90/7 or -126/7
45/63 is 5/7 simplified
(7/9) x (4/63) = (1/9) x (4/9) = 4/81
9 x 7 = 63