`a,315+(146+x)=401`
`=> 146+x=401-315`
`=> 146+x=86`
`=> x=86-146`
`=>x=-60`
Vậy `x=-60`
__
`b,(x-36):18+1=13`
`=> (x-36):18 =13-1`
`=> (x-36):18=12`
`=> x-36=12xx18`
`=>x-36=216`
`=>x=216+36`
`=>x= 252`
Vậy `x=252`
__
`c,(3x-2^4). 7^(2022)=2. 7^(2023)`
`=> 3x-16 = 2. 7^(2023) : 7^(2022)`
`=> 3x-16 = 2. 7^(2023) .` \(\dfrac{1}{7^{2022}}\)
`=> 3x-16=2 .7^1`
`=>3x-16=14`
`=>3x=14+16`
`=>3x=30`
`=>x=30:3`
`=>x=10`
Vậy `x=10`
__
`d,(2x+1)^3 -2 =5^2`
`=> (2x+1)^3 = 5^2+2`
`=> (2x+1)^3=27`
`=>(2x+1)^3=3^3`
`=>2x+1=3`
`=>2x=3-1`
`=>2x=2`
`=>x=2:2`
`=>x=1`
Vậy `x=1`
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